Violet Corn Grow a Garden

Short answer

• Violet corn is purple corn, not a separate species. The phrase is a garden and seed trade name for deep purple varieties of Zea mays, the same species as ordinary sweet corn, field corn, and popcorn. If you search the phrase online you will also meet a crop from the Roblox game Grow a Garden, which is not a real plant. This article is about the real plant in a real garden.
• Grow violet corn the same way you grow other corn, with attention to its longer season and its usual end use. Most purple flour types need about 85 to 110 days from sowing to harvest, depending on the variety, so choose a variety that fits your frost free season and start from the days to maturity on the seed packet.
• Plant after the last spring frost, when the soil has warmed to at least 50 to 55 degrees Fahrenheit, in full sun, in a block of at least three or four rows rather than a single long row. Sow seeds about 1 inch deep in clay soil, 1.5 inches deep in sandy loam, and 2 inches deep in sandy soil, with plants 8 to 12 inches apart in rows about 3 feet apart.
• Corn is wind pollinated, so block planting matters more than any other single step. Keep violet corn at least 250 feet from other corn varieties that tassel at the same time, or stagger plantings so maturity dates are at least 14 days apart, or pollen from yellow or white corn will change the color and character of your purple kernels.
• Decide before you sow whether you want fresh eating or flour. For fresh eating, pick at the milk stage, about 18 to 23 days after silks appear, when the silks are brown and dry and a pierced kernel releases milky juice. For flour, leave the ears on the stalk until the husks are dry and papery and the kernels are hard and will not dent under a thumbnail, then cure the ears in a dry, ventilated place for several weeks before shelling and storing the kernels airtight.

What Violet Corn Is, and What It Is Not

Violet corn is purple corn. The name describes the color of the kernels, not a separate species or a separate set of growing rules. All corn grown in home gardens, whether yellow sweet corn, white sweet corn, popcorn, or deep purple flour corn, belongs to the species Zea mays. The United States Department of Agriculture Agricultural Research Service describes purple corn in exactly those terms, as Zea mays L., and its research on purple corn concerns anthocyanins, the natural pigments that give the kernels their color, in the grain and in other parts of the plant.

That point clears up the first confusion a gardener meets. Search results for the exact phrase “violet corn grow a garden” mix two different things. One set of results is about real purple corn in real gardens. Another set is about a crop in the Roblox game Grow a Garden, where Violet Corn is a limited time game item obtained through crafting events. The game crop has nothing to do with soil, frost dates, or pollination. If you came here from a game search, this article will not help you win a crafting recipe. If you want to grow the real plant, read on.

The second confusion is the name itself. Seed sellers and gardeners use several overlapping names for the same group of plants: violet corn, purple corn, blue corn, and, for the Peruvian type, Maiz Morado. The colors overlap too. Some varieties are a deep, almost black purple. Others are a lighter violet blue, or a mix of blue, violet, and white kernels on one ear. The color comes from anthocyanins, pigments that the plant produces in the kernels and, in some varieties, in the stalks, leaves, tassels, and silks as well. The pigment affects color only. It does not change the basic needs of the plant: warm soil, full sun, fertile ground, steady water, and wind borne pollen.

The third confusion is about taste and use. Most violet corn sold for home gardens is a flour corn or flint corn, not a sweet corn. That distinction matters at harvest and in the kitchen, and it is the reason this article treats fresh eating and flour as two different harvests. A Colorado State University Extension account of growing Maiz Morado in Pueblo, Colorado, makes the point from direct experience: eating it fresh on the cob is possible, but it is less sweet than American sweet corn on the cob, with a rich and nutty flavor, and its more common uses are as flour and in traditional Peruvian preparations. Plan for that from the start, and you will not be disappointed when your purple ears do not taste like a supersweet hybrid.

For the general method of growing corn, this article builds on the companion guide to growing corn (AMB-733), which covers corn growing in general. This article focuses on what is different or especially important for violet and purple varieties: choosing a purple variety that fits your season, protecting the purple color from cross pollination, judging two different harvest stages, and drying and storing a flour type properly.

Choosing a Violet Corn Variety

Start with the seed packet, and read it the way you would read a recipe: days to maturity first, then end use, then plant size. Violet corn varieties differ more in season length and use than in care. The care is largely the same. The season is not.

Maiz Morado is the best known purple corn and the natural starting point. It is a traditional Peruvian variety, bred in the high Andes, with deep purple kernels rich in anthocyanins. Colorado State University Extension records a home garden planting of Maiz Morado from Baker Creek seed, with 100 days to maturity recommended for that variety, and describes a striking plant: leaves and stalks streaked black, purple, and red, dusky tassels, almost magenta silk, and several ears per plant. A 100 day variety needs a long, warm season. In a short season climate, it is a gamble unless you sow as early as your soil allows and your first fall frost is reliably late.

Mountain Morado is a useful alternative for northern gardeners. It is a deep purple, anthocyanin rich flour corn selected in Montana for colder conditions, and seed sellers list it at 85 to 90 days to maturity. That shorter season is the whole point of the variety: the same deep color and flour use, in a plant bred to finish where a 100 day Andean variety might not. Treat the 85 to 90 day figure as a seed seller listing, not an extension trial result, and check it against your own frost dates before you commit a whole bed to it.

Shades of Blue is a third example, and it shows how wide the color range is. Reimer Seeds lists it as an open pollinated variety with mixed shades of light and dark blue corn, including sky blue and violet blue, at 110 days to maturity, with plants 6 to 10 feet tall, grown for decoration, novelty popcorn, and grinding into blue cornmeal or flour. A 110 day variety is a long season commitment, and it suits a gardener with a long summer and room for tall plants.

Three practical rules follow from those examples. First, match days to maturity to your frost free season, with a margin of two weeks or more for a cool summer. A variety that needs 100 days will not reliably finish in a 95 day season. Second, decide the end use before you buy: flour types for grinding and traditional drinks, dual purpose types for decoration and meal, and sweet purple types, where you can find them, for fresh eating. Third, buy from a reputable seed source and keep the packet. The packet is your authority for that variety’s days to maturity, plant height, and spacing, and extension guidance is general where the packet is specific. If the packet and a general guide disagree on spacing, follow the packet.

Is Violet Corn Right for Your Garden

Violet corn is a warm season, full sun, space hungry crop, and honesty at the planning stage saves a season of disappointment. Before you sow, check four things: season length, sun, space, and neighbors.

Season length is the first test. Corn is a warm season crop that does not tolerate frost, and violet flour types are commonly among the longer season corns. Count the days between your average last spring frost and your average first fall frost, then compare that number with the days to maturity on the packet, plus a margin for slow growth in a cool spring. If the numbers are close, choose the shortest season purple variety you can find, sow as early as the soil allows, and consider a warm microclimate such as the south side of a raised bed. If the numbers do not fit at all, violet corn is a poor choice for that year, and a shorter season vegetable will serve you better.

Sun is the second test. New Mexico State University Extension states that sweet corn needs at least eight hours of direct sunlight each day, and the University of Georgia Cooperative Extension gives eight to ten hours for home garden sweet corn. Violet corn has the same need. A spot that gets six hours of sun will grow corn, but it will grow it slowly and with thinner ears. A spot shaded by a fence, a tree, or a house for half the day is not a corn spot. If your only sunny ground is small, a compact variety in a block is a better plan than a tall variety squeezed into shade.

Space is the third test. Corn needs a block, not a row, and a block needs room. New Mexico State University Extension advises a block at least three to four rows wide, with at least nine plants in a home garden block. The University of Georgia advises four or more short rows side by side instead of one long row. A block of nine plants in rows 3 feet apart occupies roughly 9 feet by 3 feet at minimum, and a block of 16 plants in four rows of four is a more reliable size for good pollination. If you have only a narrow strip, corn will pollinate poorly and many kernels will be missing. A single row along a fence, the mistake described in the Colorado Extension account, produced many ears with very few kernels, because wind borne pollen had nowhere to land except on the same few plants.

Neighbors are the fourth test, and gardeners often forget it. Corn pollen travels on the wind, and any corn tasseling nearby at the same time can pollinate your violet corn. That includes a neighbor’s sweet corn, a nearby field, and another variety in your own garden. If you cannot separate varieties by distance or by time, grow one corn variety only, and accept that saved seed will not stay true. The isolation rules are set out in the pollination section below.

If those four tests pass, violet corn is a rewarding crop. It is also a beautiful one. The purple stalks, magenta silk, and dark ears make it an ornamental plant as well as a food plant, and a block of it in full leaf is one of the most striking sights in a summer vegetable garden. That beauty is a bonus, not a reason to plant it in the wrong spot.

Site and Soil

Choose the sunniest, most sheltered spot you have, with deep, well drained soil. Corn grows best in deep, sandy loams with adequate organic matter, according to New Mexico State University Extension, and in loamy, well drained soils according to the University of Georgia. Heavy clay that stays wet will rot seed and stunt roots. Very light sand will dry out between waterings and need more frequent feeding. Either can be improved, but neither should be accepted as it is.

Test your soil before you plant, and let the test decide your amendments. Both extension guides cited here recommend a soil test through your local county Extension office as the best way to determine lime and fertilizer needs. A test costs little and answers the two questions that matter most: the pH of your soil, and whether it is short of any major nutrient. If you are starting a new vegetable bed, the guide to starting a vegetable garden (AMB-001) covers site choice and bed preparation in general, and the notes on organic matter and soil (AMB-815) explain how organic matter improves structure and water holding.

Soil pH guidance differs by region, and the difference is worth stating plainly. The University of Georgia gives an optimum pH of 6.0 to 6.5 for sweet corn. New Mexico State University Extension states that sweet corn will perform well at a soil pH of 6.5 to 8.0, reflecting the alkaline soils of that region. The practical lesson is not to chase a single magic number, but to keep the soil near neutral, to correct a strongly acid or strongly alkaline soil on the basis of a soil test, and to add organic matter, which buffers pH and improves both drainage and water holding in most soils. If your soil test shows a pH far outside the 6.0 to 8.0 range, correct it before planting, because corn will struggle no matter how well you water and feed it.

Prepare the bed by working in 1 to 3 inches of compost with a rototiller or garden fork, as New Mexico State University Extension advises, and by tilling the soil to a depth of 6 to 8 inches, as the University of Georgia advises, while avoiding tilling soil that is too wet, which forms large clods. A level seedbed free of clods and trash gives even germination. If you make your own compost, the guide to starting a compost bin (AMB-814) covers the setup. For beds, remember that garden soil and potting mix are not the same thing: the comparison of garden soil, potting soil, and potting mix (AMB-1498) explains which belongs in a bed and which belongs in a container.

If you garden in raised beds, site them where they get full sun, and plant on the south side of beds that run east to west, which warms the soil earlier in spring. Black plastic mulch laid two weeks before planting will also warm the soil, and seed can be planted directly through it, according to New Mexico State University Extension. That trick is most useful in a cool spring, where warm soil is the difference between seed that germinates in a week and seed that rots in cold ground.

When and How to Sow

Timing is the first decision, and soil temperature matters more than the calendar. Corn seed should be planted on or after the average date of the last killing frost, when the soil in the upper 3 inches has reached at least 50 to 55 degrees Fahrenheit, according to New Mexico State University Extension. The optimal soil temperature for all sweet corns is 75 to 95 degrees Fahrenheit, and low soil temperatures at planting cause poor germination and delayed growth. The University of Georgia gives the same practical rule in slightly different words: wait until at least two weeks after the last average killing frost, plant only when soil temperatures are between 60 and 90 degrees Fahrenheit, and expect weak stands, stunted growth, or frost killed seedlings if you plant too early. The guide to when to sow corn (AMB-1609) covers timing in more detail.

Use a soil thermometer, and measure in the morning at seed depth for several days before you sow. Air temperature is a poor guide: a warm afternoon can hide cold soil, and seed sown into cold, wet soil may rot before it germinates. If your soil is still below 50 degrees Fahrenheit, wait. A later planting in warm soil will usually catch up with an early planting in cold soil, because the later plants grow faster from the start.

Sow seed directly where it is to grow. Corn does not transplant well, and direct sowing avoids the check to growth that comes from moving a seedling. Sow at the depth that suits your soil: 1 inch deep in clay, 1.5 inches deep in sandy loam, and 2 inches deep in sandy soils, according to New Mexico State University Extension. The University of Georgia gives 1 inch deep as a general figure. Shallower sowing in cool soil and deeper sowing in sandy soil follow the same logic: the seed needs steady moisture, but it also needs warmth and air, and the right depth balances the two.

Space the seed 8 to 12 inches apart in the row, with rows about 3 feet apart, following the University of Georgia guidance. Thin to the spacing on the packet if the packet gives a wider figure for a large eared variety. Sow two or three seeds per spot and thin to the strongest seedling if your germination is uncertain, or sow in hills of two to three plants per hill with hills spaced 3 feet apart, as New Mexico State University Extension describes. Either method works. What does not work is a single long row, or plants spaced so widely that pollen cannot travel from tassel to silk.

Plant in a block. This is the single most important piece of advice in this article, and every extension source cited here repeats it. Corn is wind pollinated, and a block of at least three or four rows wide, with at least nine plants, gives pollen many chances to land on silk. Four or more short rows side by side are better than one long row of the same number of plants. If you have room for only nine plants, plant them in a three by three square. If you have room for 16, plant four rows of four. The square shape is the reason the Colorado Extension gardener’s neighbors grew corn in a square rather than in rows: in a square, pollen from the tassels is much more likely to reach the silk.

For a continuous harvest, make successive plantings two weeks apart, or plant early, mid season, and late season varieties, as the University of Georgia advises. Sweet corn matures in 60 to 100 days depending on the variety, and the same range covers most violet corn, with the longer season types at the far end. Note that a later planting will develop faster than an early planting because the weather is warmer, so the gap between harvests will be shorter than the gap between plantings.

Watering and Feeding

Corn is a heavy feeder and a heavy drinker, and violet corn is no exception. The two needs go together: a plant that is short of water cannot take up nutrients, and a plant that is short of nutrients cannot use water well.

Water deeply and steadily. The University of Georgia states that corn requires a minimum of 1 inch of water per week for normal development, and that the most critical periods for water are during pollination and during final ear filling. Water sufficiently to moisten the soil to a depth of 6 inches, and irrigate in the early morning or early evening so foliage can dry before dark. Soaker hoses or drip irrigation placed alongside the rows deliver water to the roots while keeping foliage dry, and they conserve water at the same time. Sandy soil dries faster than clay, so water sandy beds more often, and check with a trowel: if the soil is wet only an inch or two down, keep watering.

Watch the plant, not the calendar. Corn that is drought stressed during tasseling and silking will produce ears with missing kernels, because dry silks do not receive pollen well and dry pollen does not travel well. The University of Georgia lists poor kernel development from dry weather during silking as a common cultural problem, alongside planting too close, poor fertility, too few rows in a block, and lodging from too much nitrogen or wind damage. If a hot, dry spell arrives while your corn is tasseling, water deeply that week even if it means watering more than once.

Feed on the basis of a soil test where you can, and by sidedressing where you cannot test. New Mexico State University Extension advises applying nitrogen fertilizer in split applications: half with the phosphorus before planting, and the rest in increments when the plants are 8 to 10 inches tall and again when they are 18 to 24 inches tall, with the fertilizer covered with soil to reduce loss of nitrogen into the air as ammonia. The University of Georgia gives a general guideline where no soil test has been done: apply a balanced fertilizer before planting, then sidedress two to three times during the growing season, digging a shallow trench along the row, applying the fertilizer, and covering it with soil. More frequent sidedressing may be needed on sandy soils or when heavy rain washes nutrients away.

Do not overfeed with nitrogen. Too much nitrogen produces tall, soft growth that lodges, meaning it falls over, in wind, and it can delay maturity. A plant that is dark green, tall, and falling over is not a healthy plant; it is an overfed one. Compost worked into the bed before planting, plus one or two sidedressings during growth, is enough for most home gardens with reasonably fertile soil. If your soil test shows a specific shortage, correct that shortage rather than adding more of everything.

Mulch after the plants are established. A layer of organic mulch around the plants conserves moisture, suppresses weeds, and keeps the soil temperature steady. Keep the mulch a few inches away from the stems so air can circulate. Light, shallow cultivation between rows will also keep weeds down, but take care not to damage the shallow roots, and mound soil 2 to 3 inches up around the base of the plants after cultivating, to support the stalks against wind, as the University of Georgia advises.

Pollination: The Step That Decides Your Harvest

Corn has male and female parts on the same plant, and it is wind pollinated. The tassel at the top of the plant is the male flower, and it releases pollen. The silks that emerge from each young ear are the female flower, and each silk leads to one kernel. A kernel forms only if a grain of pollen lands on its silk. That simple fact explains almost every disappointment in corn growing: an ear with kernels missing in patches was not pollinated on those silks, and no amount of later watering or feeding can fill the gaps.

Block planting is the main defense, and it is described in the sowing section above. Hand pollination is a useful backup, especially for a small block. When the tassels are shedding pollen and the silks are fresh and green, shake a tassel over the silks of nearby plants, or cut a tassel and tap it gently over the silks. The Colorado Extension account recommends hand pollination even for common yellow and white sweet corn, after the author’s own Maiz Morado planting suffered pollination problems despite producing some beautiful full ears. Do it in the morning, when pollen is shedding, and repeat it over several days while silks are fresh.

Heat is a second threat to pollination. High temperatures can make pollen sterile, and the Colorado Extension account notes that planting early allows pollination to take place while temperatures are lower. In southern New Mexico, extremely high late summer temperatures can cause poor pollination, especially if accompanied by drying winds, according to New Mexico State University Extension. If your summers are very hot, sow as early as the soil allows, choose a variety that tassels before the worst heat, and keep the plants well watered during tasseling and silking. For the wider role of pollination in the garden, the explainer on why pollination is important (AMB-1996) sets out the process in general terms.

Isolation is the third part of pollination, and it is the part that protects the purple color. Corn varieties cross pollinate freely, and the kernels on an ear show the effect in the same season, because each kernel is a seed with its own father. If yellow sweet corn pollen reaches your violet corn silks, the kernels on that ear will include yellow or mixed kernels, and the deep purple color you planted for will be diluted. If your violet corn pollen reaches a neighbor’s sweet corn, their kernels will change too, which is a reason to talk to neighbors before you plant.

New Mexico State University Extension advises separating varieties by at least 250 feet, or preventing cross pollination by planting varieties with different maturity ratings at the same time, or by planting varieties with the same maturity rating in successive plantings 14 days apart. The University of Georgia gives a longer distance, 500 feet or more, for supersweet types, whose pollen is weak and easily supplanted, and 400 yards or one month apart in maturity for supersweet and multi gene varieties. Those longer figures apply to supersweet corn, not to violet flour corn, but they show the scale of the problem: 250 feet is a minimum, not a generous margin, and it is measured to the nearest corn that tassels at the same time, not to the nearest corn of any kind. In a small garden, the practical answer is usually to grow one corn variety only in a given year, or to stagger plantings by at least 14 days and accept some risk at the edges of the block, where outside pollen lands first. If you save seed, grow only one variety and isolate it, or the seed will not stay true to type.

Care Through the Season

Once the plants are up, the work is mostly watching and steady care. Keep the rows clean and free of weeds, because weeds compete for water and nutrients and harbor pests and diseases. Shallow cultivation is enough; deep hoeing near the plants damages roots. Mulch helps here too, by blocking weed germination and holding moisture.

Watch for lodging after wind or heavy rain. Tall corn in soft, wet soil can lean or fall, especially if it was overfed with nitrogen. Mounding soil around the base of the plants, as described above, gives the brace roots something to grip. Brace roots are the thick roots that emerge from the lower nodes of the stalk above the soil, and they are a normal part of the plant, not a sign of disease. The Colorado Extension account describes them on Maiz Morado as several levels of black nubs that can grow into brace roots.

Pests are usually manageable in a home garden, and the first step is to know which ones to expect. The University of Georgia lists corn earworm, aphids, and flea beetles as common insect problems, and notes that cutworms, seed corn maggots, Southern corn rootworm, wireworms, fall armyworm, European corn borers, and Japanese beetles may also appear. Earworm caterpillars and borers feed on the developing ears, often near the tip, leaving a chewed area of kernels.

Avoid spraying on a schedule. Check the silks and ears regularly from the time silks appear, remove badly infested ears promptly, clear plant debris after harvest so pests and diseases do not overwinter in old stalks, and ask your local county Extension office for control recommendations suited to your area before you use any insecticide. Smut, the swollen gray galls that sometimes appear on ears, should be removed promptly from the stalks and the garden area, as the University of Georgia advises.

Disease is seldom a serious problem for sweet corn in the home garden when cultural practice is sound. The University of Georgia lists the practices that reduce most disease problems: obtain seed from a reputable source, plant when the soil temperature is above 55 degrees Fahrenheit to reduce seedling rots, keep the garden free of nearby weeds, remove smut infested ears promptly, and remove plant debris after harvest. Damping off, the rotting of seedlings at soil level, is the most common early disease, and warm soil and good drainage are the best defenses against it.

Companion planting is often suggested for corn, and the traditional Three Sisters planting of corn, beans, and squash is the best known example. The corn provides support for climbing beans, the beans add nitrogen to the soil, and the squash leaves suppress weeds. The Colorado Extension gardener planted beans after the corn was 6 to 12 inches tall, following the traditional timing, and found that a late planting in hot weather meant the beans failed to germinate. If you try the Three Sisters, plant the corn first, add climbing beans when the corn is about 6 to 12 inches tall, and add squash about a week after the beans. The guides to how beans grow (AMB-1198) and how to cultivate beans (AMB-1606) cover the bean half of that planting. The same wave as this article includes a guide to when to plant beans, AMB-2096, which was not yet live when this article was written; confirm that it is live before linking to it from a published page.

Growing Violet Corn in Containers

Corn in a container is possible, but it is a compromise, and it suits a compact variety better than a tall flour corn. The problem is pollination: a container holds few plants, and few plants mean little pollen. If you grow corn in containers, grow at least nine plants in a block of containers pushed together, so the tassels are close enough for pollen to travel, and be ready to hand pollinate every day while the silks are fresh.

Use the largest containers you can manage, with drainage holes, filled with a good potting mix, not garden soil. A single plant needs a container of at least 5 gallons, and a half barrel or a large fabric pot is better. Water more often than in the ground, because containers dry out faster, and feed lightly but regularly, because watering washes nutrients out of a container. Place the containers in the sunniest spot you have, sheltered from strong wind, and water at the base of the plants. The guide to growing tomatoes in pots (AMB-013) covers container watering and feeding in general, and the same principles, large container, good mix, steady water, apply to corn.

For most gardeners, a small raised bed is a better choice than containers for violet corn. A 4 foot by 4 foot bed holds nine to twelve plants in a block, keeps the soil temperature steadier than a pot, and needs watering less often. If containers are your only option, choose the shortest, most compact purple variety you can find, accept that the ears will be smaller, and enjoy the plant for its color as much as for its harvest.

Harvest: Fresh Eating or Flour, Not Both

Violet corn asks you to choose a harvest, because the two harvests happen at different stages. Fresh eating happens early, at the milk stage. Flour happens late, when the kernels are fully dry. An ear picked for one purpose cannot serve the other.

For fresh eating, use the milk stage test from Iowa State University Extension. Sweet corn should be harvested at the milk stage, when the silks are brown and dry at the ear tip, and a soft kernel punctured with a thumbnail produces a milky juice. An immature ear will not be filled to the tip, and its kernels produce a clear, watery liquid when punctured. An overmature ear is tough and doughy. The harvest date can be estimated by noting the date of silk emergence: the number of days from silk emergence to harvest is approximately 18 to 23 days, although prime maturity may be reached in 15 days or less if day and night temperatures are exceptionally warm. The upper ear usually matures one or two days before the lower ear. Harvest by grasping the ear at its base and twisting downward, and use or refrigerate the corn immediately, because the sugar in sweet corn converts to starch quickly after picking. The University of Georgia adds that most corn loses half its flavor within 12 to 18 hours of picking if left unrefrigerated, and that keeping the corn cool is the key to better flavor.

That guidance was written for sweet corn, and it applies to violet corn only where the variety is a sweet type eaten fresh. For the flour types that make up most violet corn, fresh eating is a smaller harvest, and the flavor will be less sweet and more nutty than a sweet corn, as the Colorado Extension account reports for Maiz Morado. If you pick a flour type at the milk stage, pick only a few ears for the table, leave the rest to dry for flour, and do not judge the variety by those early ears.

For flour, wait. Cooperative Extension guidance for popcorn and other dry corns, which are harvested dry in the same way as flour corn, states the rule plainly: the husks should be dry and papery, with no green left in them, the silks should be dry and brittle, and the kernels should be hard and fully colored. Do not harvest while the husks are at all green. Check by opening the top of one ear to see that the kernels are fully developed and have the right color. When the corn looks ready, stop watering, harvest the ears, remove the husks, and put the ears in a well ventilated place for several weeks, for example in a netted bag hung on a hook or laid out on a table, until fully dry. A kernel that dents under a thumbnail is not dry enough. A kernel that is hard and will not dent is ready. The Colorado Extension account adds a useful warning from experience: heirloom varieties often have smaller, thinner ears than store bought sweet corn, and a large ear may carry one well developed ear with dark mature kernels plus one or two smaller, pale ears. Judge ripeness by the kernels, not by the size of the ear.

Watch the weather while the ears are drying on the stalk. If a hard frost or a long stretch of wet weather is coming before the ears finish drying, pick them early and complete the curing indoors in a warm, dry, airy place. Wet ears left in the field will mold, and moldy corn should not be eaten or stored with sound corn. Pick on a dry day, after the morning dew has dried, and handle the dry stalks gently, because they are brittle and snap easily.

Drying, Shelling, and Storage

Drying is not a single step. It is a process that continues after harvest, and rushing it is the most common reason stored corn spoils. After picking, husk the ears and spread them in a single layer or hang them in mesh bags in a warm, dry place with good air circulation, out of damp and out of reach of rodents. Turn or move the ears every few days so all sides dry evenly, and check where ears touch each other for signs of mold, especially in a humid climate. Allow several weeks. The exact time depends on the weather, the variety, and the airflow, and no fixed number of days fits every garden.

Test before you store. Shell a few kernels from one ear and press one with a thumbnail. If it dents, dry the ears longer. If it is hard and will not dent, the corn is dry enough to shell. For popcorn types, Extension guidance suggests popping a small handful as a test: if most kernels pop well and taste good, the corn is dry enough. Violet flour corn will not pop, so the thumbnail test is the one to use, together with the color and hardness of the kernels.

Shell the kernels by twisting two ears together or rubbing them over a coarse surface, and winnow away the light chaff. Store the dry kernels in a jar with a tight lid or another airtight container, in a cool, dry, dark place. Do not wash the kernels before storage, because added moisture works against the drying you have just done. Properly dried corn stored airtight will keep for a long time, and flour ground from it will keep best in a cool place in a sealed container, ground in small batches as you need it.

Sweet corn for fresh eating stores differently, and the difference matters. Iowa State University Extension gives optimum storage conditions for sweet corn as a temperature of 32 degrees Fahrenheit and a relative humidity of 95 percent, which in practice means the refrigerator, used promptly. Do not store fresh sweet corn at room temperature and expect it to keep its flavor. The 32 degree figure is for fresh sweet corn, not for dry flour corn, and the two should never be confused.

Saving Seed

Saving seed from violet corn is possible, and it is also where cross pollination has its longest effect. If your violet corn was pollinated by another corn variety, the seed you save will produce mixed plants next year, with kernels of mixed colors and types. That is not a defect in the seed. It is exactly what cross pollination means.

To save seed that stays true, grow one corn variety only, isolate it by the distances given in the pollination section, or stagger plantings so no other corn tassels at the same time, and save seed from the best ears in the center of the block, where outside pollen is least likely to have reached. Let the ears dry fully on the stalk, then cure them as for flour, shell the kernels, and store them cool and dry in a sealed container, labeled with the variety and the year. Germination falls over time, so test a few seeds before you rely on a saved batch, and buy fresh seed if the test is poor.

If you grew more than one variety, or you are not sure about isolation, enjoy the harvest and buy fresh seed next year. The cost of a packet is small, and the certainty is worth it.

Cooking and Uses

The kitchen is where violet corn earns its place, and its uses follow from its type. Flour corn becomes flour, meal, and traditional dishes. Sweet types become fresh corn on the cob. Decoration types become autumn displays. Do not ask one variety to do all three.

For flour, grind the dry kernels in a grain mill or a powerful blender, in small batches, and sieve the flour if you want a finer texture for baking. Purple corn flour gives a distinctive purple color to cornbread, tortillas, polenta, and pancakes, and its high anthocyanin content is the reason for the color. Use it in recipes that suit a corn flour: flatbreads, tortillas, porridge, and baked goods where cornmeal is the base. It will not behave like wheat flour, because it has no gluten, so follow recipes written for cornmeal rather than substituting it cup for cup into a wheat recipe and expecting the same rise.

Two traditional Peruvian preparations are worth knowing, because they are the reason Maiz Morado has been grown for centuries. Chicha morada is a drink made from purple corn, and mazamorra morado is a dessert pudding made from the same corn. Both are described in the Colorado State University Extension account of growing Maiz Morado, which notes that eating the corn as a sweet corn is less common than using it as flour, and that Peruvians make these two preparations from it. If you want to try them, use a recipe from a Peruvian cookbook or a tested food source, and treat the corn as an ingredient, not as a medicine: this article makes no health claim for purple corn, and the anthocyanin research cited here concerns pigments and food colorants, not the treatment or prevention of disease.

For fresh eating, pick at the milk stage as described above, husk the ears, remove the silk, and cook them promptly, by boiling, grilling, or roasting. Expect a less sweet, richer, nuttier flavor than a supersweet yellow corn, and expect your fingers and mouth to be stained purple, as the Colorado Extension gardener found when she ate Maiz Morado on the cob. The stain washes off within the day, and it is a useful reminder that the pigment is strong enough to color food, drink, and hands alike.

For decoration, let the ears dry fully on the stalk, then use them with the husks pulled back for wreaths, table centerpieces, and autumn displays. The deep purple kernels hold their color well when dry, and a bunch of dried ears is one of the simplest decorations a garden can produce. Keep decorative ears dry and out of damp, or they will mold like any stored corn.

Troubleshooting

Most violet corn problems have a simple cause, and the table below lists the common ones with the most likely explanation. Check the simplest cause first.

Common Questions About Violet Corn

Is violet corn the same as purple corn? Yes, for garden purposes. Violet corn is a name used for deep purple varieties of Zea mays, the same species as other corn. The names violet, purple, and blue corn overlap in seed catalogs, and the exact shade depends on the variety and on how the pigment develops.

Is violet corn a real plant or a game item? Both, and the two should not be confused. Violet Corn is also a crop in the Roblox game Grow a Garden, where it is obtained through crafting events. The real plant is purple corn grown in a garden, and this article is about the real plant only.

Can I grow violet corn in a small garden? Yes, if you can fit a block of at least nine plants in full sun. A 4 foot by 4 foot bed is a practical minimum. A single row will pollinate poorly and give thin ears. Containers are possible for compact varieties, but a small bed is better.

Does violet corn need different soil from sweet corn? No. It needs the same fertile, well drained soil, near neutral pH, with compost worked in before planting. Extension guides give an optimum pH of 6.0 to 6.5 in Georgia and good performance at 6.5 to 8.0 in New Mexico, so a soil test is the best guide for your ground.

How long does violet corn take to grow? It depends on the variety. Mountain Morado is listed at 85 to 90 days, Maiz Morado at about 100 days, and Shades of Blue at 110 days. Check the packet for your variety, and count from sowing to the harvest stage you want, not from transplanting.

Why are my purple kernels mixed with yellow ones? Cross pollination. Another corn variety tasseling at the same time pollinated your violet corn, and each kernel shows its own father. Isolate varieties by at least 250 feet or by 14 days in maturity next year, or grow one variety only.

Can I eat violet corn fresh? You can, at the milk stage, but most violet corn is a flour type, and it will be less sweet and more nutty than a sweet corn. Pick a few ears for the table and leave the rest to dry for flour.

Is purple corn good for you? This article makes no health claim. Purple corn kernels contain anthocyanins, the pigments that give them their color, and research on purple corn anthocyanins concerns their diversity and their use as natural food colorants. Any health claim would need evidence of a kind this article does not provide, and it is not made here.

FAQ

What is violet corn?

Violet corn is purple corn, a group of deep purple varieties of Zea mays, the same species as ordinary corn. The color comes from anthocyanins, natural pigments in the kernels and sometimes in the stalks, leaves, tassels, and silks. The phrase is also the name of a crop in the Roblox game Grow a Garden, which is not a real plant.

How do I grow violet corn in a garden?

Plant after the last spring frost, when the soil has reached at least 50 to 55 degrees Fahrenheit, in full sun, in a block of at least three or four rows. Sow seeds 1 inch deep in clay, 1.5 inches deep in sandy loam, and 2 inches deep in sandy soil, 8 to 12 inches apart in rows about 3 feet apart. Water at least 1 inch per week, feed by sidedressing on the basis of a soil test, and hand pollinate while the silks are fresh if your block is small.

When should I plant violet corn?

Plant after the last spring frost, and at least two weeks after the last average killing frost in the guidance from the University of Georgia, when the soil temperature is between 60 and 90 degrees Fahrenheit. Use a soil thermometer at seed depth rather than the calendar, and do not sow into cold, wet soil.

How much sun does violet corn need?

At least eight hours of direct sunlight each day, and eight to ten hours in the University of Georgia guidance. A spot with less sun will grow corn slowly and with thinner ears.

How far apart should I plant violet corn?

Sow seeds 8 to 12 inches apart in rows about 3 feet apart, in a block at least three or four rows wide with at least nine plants. Four or more short rows side by side are better than one long row, because corn is wind pollinated.

How do I stop my violet corn crossing with other corn?

Separate varieties by at least 250 feet, or plant varieties with different maturity ratings at the same time, or plant varieties with the same maturity rating in successive plantings 14 days apart, following New Mexico State University Extension. In a small garden, the simplest answer is to grow one corn variety only in a given year.

When is violet corn ready to harvest?

For fresh eating, pick at the milk stage, about 18 to 23 days after silks appear, when the silks are brown and dry and a pierced kernel releases milky juice. For flour, leave the ears on the stalk until the husks are dry and papery and the kernels are hard and will not dent under a thumbnail, then cure the ears in a dry, ventilated place for several weeks.

How do I store violet corn?

Dry flour corn fully, shell the kernels, and store them airtight in a cool, dry, dark place. Do not wash the kernels before storage. Fresh sweet corn is different: refrigerate it immediately at about 32 degrees Fahrenheit and use it promptly, because it loses flavor quickly at room temperature.

Can I grow violet corn in a container?

You can, with a compact variety in a large container of at least 5 gallons, but a block of at least nine plants pushed together is needed for pollination, and hand pollination is advisable. A small raised bed is a better choice for most gardeners.

What can I cook with violet corn?

Grind dry kernels into flour for cornbread, tortillas, polenta, and pancakes, or use traditional Peruvian preparations such as chicha morada, a drink, and mazamorra morado, a dessert pudding, both made from purple corn. Fresh ears can be boiled, grilled, or roasted at the milk stage, with a less sweet and more nutty flavor than sweet corn.

Sources & references

• New Mexico State University Extension. Home and Market Garden Sweet Corn Production, Guide H-223. Sweet corn needs at least eight hours of direct sunlight each day; soil temperature in the upper 3 inches should be at least 50 to 55 degrees Fahrenheit, with an optimal soil temperature of 75 to 95 degrees Fahrenheit and optimal plant growth at 75 to 86 degrees Fahrenheit; plant in blocks at least three to four rows wide with at least nine plants in a home garden block; separate varieties by at least 250 feet or by 14 days in maturity; plant 1 inch deep in clay, 1.5 inches deep in sandy loam, and 2 inches deep in sandy soils; sweet corn performs well at a soil pH of 6.5 to 8.0; nitrogen in split applications when plants are 8 to 10 inches tall and again at 18 to 24 inches tall. https://nmsu.contentdm.oclc.org/digital/api/collection/AgCircs/id/101007/download
• University of Georgia Cooperative Extension. Growing Home Garden Sweet Corn, Circular 905. Sweet corn needs soil temperatures between 60 and 90 degrees Fahrenheit and planting at least two weeks after the last average killing frost; plant in an area that receives at least eight to ten hours of sunlight; plant seed about 1 inch deep in rows 3 feet apart with 8 to 12 inches between each seed; plant four or more short rows side by side for pollination; optimum pH 6.0 to 6.5; a minimum of 1 inch of water per week, with pollination and final ear filling the most critical periods, watered to a depth of 6 inches; sweet corn matures in 60 to 100 days; harvest at the milk stage about 20 days after the first silk strands appear; most corn loses half its flavor within 12 to 18 hours of picking if left unrefrigerated. https://fieldreport.caes.uga.edu/publications/C905/growing-home-garden-sweet-corn/
• Iowa State University Extension and Outreach. When should I harvest sweet corn? Sweet corn should be harvested at the milk stage, when the silks are brown and dry at the ear tip and a punctured kernel produces a milky juice; the number of days from silk emergence to harvest is approximately 18 to 23 days; the upper ear usually matures one or two days before the lower ear; optimum storage conditions for sweet corn are 32 degrees Fahrenheit and 95 percent relative humidity. https://yardandgarden.extension.iastate.edu/faq/when-should-i-harvest-sweet-corn
• Colorado State University Extension, Pueblo County. Corn Story, by Kristina Langan, Colorado Master Gardener. A home garden planting of Maiz Morado, a traditional Peruvian variety, with 100 days to maturity recommended for the seed obtained; deep purple kernels heavy in anthocyanins; leaves and stalks streaked black, purple, and red, dusky tassels, almost magenta silk, several ears per plant, and plants to seven feet tall; eating Maiz Morado as a sweet corn is less common than using it as flour; Peruvians make the drink chicha morada and the dessert pudding mazamorra morado; fresh eating was less sweet than American sweet corn on the cob, rich and nutty, and stained fingers and mouth purple; hand pollination is a good idea even for common sweet corn; high heat can make pollen sterile, so early planting lets pollination happen while temperatures are lower. https://pueblo.extension.colostate.edu/corn-story/
• United States Department of Agriculture, Agricultural Research Service. Paulsmeyer, M., Vermillion, K., and Juvik, J. 2022. Assessing the diversity of anthocyanin composition in various tissues of purple corn (Zea mays L.). Phytochemistry, 2022, 201, article 113263. Anthocyanins are natural pigments in purple corn grain and in other maize tissues, including anthers, cob glumes, husks, kernels, leaf sheaths, seedlings, silks, and tassels; anthocyanin extracts have applications as food, beverage, textile, and nutraceutical colorants. https://www.ars.usda.gov/research/publications/publication/?seqNo115=392305
• Cooperative Extension, Ask Extension. Growing popcorn corn, expert response. For dry corns harvested like popcorn and flour corn: the husks should be dry and papery, with no green left; the kernels should be hard and fully colored; the silks should be dry and brittle; stop watering when the corn looks ready; remove the husks and put the ears in a well ventilated place for several weeks until fully dry; store the kernels in a jar with a tight lid. https://ask.extension.org/kb/faq.php?id=912843
• Reimer Seeds. Shades of Blue Corn Seeds. Open pollinated variety, 110 days, plants 6 to 10 feet tall, mixed shades of light and dark blue corn including sky blue and violet blue, grown for decoration, novelty popcorn, and grinding into blue cornmeal or flour. Seed seller listing, used only for variety color and maturity as listed. https://www.reimerseeds.com/shades-of-blue-corn-seeds
• Baker Creek Heirloom Seeds. Mountain Morado Corn Seeds. Deep purple, anthocyanin rich flour corn selected in Montana for northern gardeners, listed at 85 to 90 days to maturity, planting depth 1 to 2 inches, plant spacing 12 inches, ideal temperature 60 degrees Fahrenheit. Seed seller listing, used only for variety maturity and description as listed. https://www.rareseeds.com/products/corn-seeds-mountain-morado