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SeedStepsYour vegetable garden, one step at a time.My gardenPopcorn maize is a fun project to follow from start to finish: tassels at the top, silks on the cob and eventually hard kernels to test-pop. Sow a block rather than a single ornamental plant, and set aside airy drying space for the cobs after harvesting.
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
This growing advice helps you choose. Your variety, growth stage, weather and conditions in your space determine the actual timing.
Start under cover in warmth · Popcorn maize
April–MayStart indoors in warmth and reserve enough bright space for raising plants.
Do not leave young sweetcorn in small pots too long. Popcorn needs enough season for cobs to ripen and dry.
RHS · suikermaïs ↗Britse teeltrichtlijn voor een gematigd klimaat; de genoemde perioden zijn richtlijnen voor Nederland en Vlaanderen.
University of Minnesota Extension · Growing popcorn ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
Iowa State University Extension · Growing and harvesting popcorn in the home garden ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
Guideline periods for the Netherlands and Flanders. Check the variety, available light, soil and measured temperatures. Greenhouse heating does not guarantee enough winter light.
Choose by more than the name. Discover how these varieties and crop types taste, what you can use them for and what growing them involves.
13 of 13 choices · 11 named varieties
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A classic open-pollinated yellow sweetcorn with medium cobs: especially attractive for preparing the harvest immediately fresh.
Choose Golden Bantam for an old, yellow sweetcorn and fresh summer meal rather than dry popcorn kernels.
Young kernels at the milky stage are described as meltingly tender and sweet. The best eating stage is shorter than the period during which the cob still looks attractive.
Boil or grill a freshly picked cob and eat it the same day. Waiting a long time reduces the sweetness of traditional sweetcorn.
Sow after frost in warmed soil and plant a block for wind pollination. Provide sun, feed and water during cob formation.
Harvest when a kernel releases milky juice. Do not wait until the kernels are hard and dry; that is past the sweetcorn stage.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A second-early Sativa variety prioritising sweetcorn cob quality, with greater sweetness retention after harvest.
Choose Mezdi mainly for sweet eating cobs when you cannot take every cob straight from plant to pan.
The source describes very sweet kernels that retain their sweetness after picking better than other open-pollinated selections.
Boil or grill the young cobs; process surplus soon after harvest for storage to preserve fresh quality.
Provide a warm, sunny block with enough water. Avoid flowering maize in one long row where possible.
Pick at the milk stage before kernels harden. Stated ripening time is a guide depending on season and emergence.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Sweetcorn with purplish-red plants and purplish-red kernels, selected from Double Red; colour also shapes the crop's appearance.
Choose Martian Purple for colour on both plant and cob. It is a selection from Double Red, without the two therefore being proven synonyms.
No specific sweetness comparison is given. The general sweetcorn flavour belongs to harvesting at the milky stage, not to fully dried purple kernels.
This flavour description applies to the crop; there is no separate tasting result for this variety.Boil or grill young cobs and taste them fresh. The striking colour makes the harvest special even before cooking.
Plant in a sunny block and keep enough water available during flowering and cob formation. Decorative colour does not replace good pollination.
Check milk-stage ripeness with a test kernel. Do not let all cobs dry simply to admire their final purple colour.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A vigorous sweetcorn selection with white, yellow, red and dark kernels on plants approximately 1.5–2 metres tall.
Choose Inca Rainbow for a multicoloured harvest and tall crop. It is a named selection, not an arbitrary seed mix.
The source describes sweetcorn but gives no separate ranking of sweetness. Colour variation does not prove that every kernel tastes different.
This flavour description applies to the crop; there is no separate tasting result for this variety.Boil a young cob or cut off milky-stage kernels for a cooked vegetable dish. If desired, keep a few dry cobs as a reminder of the garden.
Provide a spacious, sunny block and allow for tall plants' shade. Water matters especially during flowering and cob growth.
Harvest at the milk stage for eating. The source's long development needs a sufficiently warm, timely start in the Netherlands.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
An old, early sweetcorn whose kernels are white when young and turn black at full maturity.
Choose Black Mexican for an early heirloom and white-to-black transition, with clearly separate eating and seed maturity.
The sweetcorn quality belongs to the white, milky stage. The final black colour is a different stage, not a reason to wait longer for fresh cobs.
This flavour description applies to the crop; there is no separate tasting result for this variety.Cook young, white cobs straight after picking. Let a separate cob ripen further to follow the unusual colour change.
Sow after frost and plant in a block. If necessary, separate different maize types by flowering time or distance to limit unwanted crossing.
Check kernels while still white and at the milk stage. Do not wait for fully black, hard kernels for fresh sweetcorn.
Also listed as: Black Aztec, Mexican Sweet, Black Iroquois.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Red-purple stems, leaves and cobs make Double Red a sweetcorn variety that also colours the garden.
Choose Double Red if the entire maize crop should be a feature rather than colour only in the kernels.
A distinct sweetness profile is not described. Eat the cobs as sweetcorn at the young, milky stage, when the usual crop flavour is most pleasant.
This flavour description applies to the crop; there is no separate tasting result for this variety.Boil or grill young cobs, or cut off fresh kernels for a meal. Dry red kernels are a different product from fresh sweetcorn.
Provide a sunny block and sufficient feed. Position lower vegetables so they do not disappear completely beneath the maize.
Assess milk-stage ripeness independently of red colour. Harvest for eating before kernels dry and harden.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A very early, bicoloured sweetcorn with white and yellow kernels on cobs approximately 15 cm long.
Choose Double Standard for early development and two-coloured cobs. The recommendation for cooler areas is relevant, but no guarantee in cold soil.
A separate aroma profile is missing. The usual sweet corn flavour depends on picking at the milky stage; white and yellow mainly create a visible pattern.
This flavour description applies to the crop; there is no separate tasting result for this variety.Serve small, boiled or grilled cobs as individual portions. The described size is manageable on a plate.
Sow after frost in warm soil in a block of several rows. Early development benefits from an even start.
Check cobs in good time for kernels at the milky stage. An early variety can pass its best eating stage while a later one is not yet ready.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Multicoloured sweetcorn on plants potentially around two metres tall, developed through a targeted American cross.
Choose Painted Hills for multicoloured cobs and a slightly sweet profile. It is a named selection whose colours can vary between cobs.
The source states a lightly sweet flavour. This differs from the distinctly very sweet profile described for Mezdi.
Use young cobs for a simple boiled meal or cut kernels into a vegetable dish. Let the mild sweetness be part of the dish.
Provide sun and a spacious block. Good germination in cooler soil does not remove the need for a frost-free start.
Harvest at the milky stage for fresh eating. Dry, coloured cobs are attractive to look at, but have a different texture from sweetcorn ready to eat.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A selection with deep reddish-purple to purple cobs, listed separately as Martian Purple Red alongside Martian Purple.
Choose this offering for the red-purple cob appearance. The similar name to Martian Purple does not prove an identical selection without further documentation.
A separate flavour comparison is not described. The usual sweetcorn flavour needs young, milky kernels; colour alone does not tell you how sweet a cob is.
This flavour description applies to the crop; there is no separate tasting result for this variety.Boil or grill young cobs fresh. Leave a separate cob to ripen if you also want to see final purple colour.
Plant in a warm, sunny block and keep soil sufficiently moist during flowering.
Check kernels for milky juice and pick for fresh eating before they dry completely. Note in your garden when this selection ripens.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Small red cobs the size of a large strawberry: a popcorn offering looking little like a long sweetcorn cob.
Choose this type for small decorative cobs and the pleasure of home-grown popcorn. Its harvest has a different purpose from sweet, fresh corn.
A separate aroma is not described. The eating result is popcorn; the kernels must dry for this rather than being eaten at the milky stage.
This flavour description applies to the crop; there is no separate tasting result for this variety.Dry cobs well and test a few kernels in a pan with oil. Popping results partly depend on moisture content.
Grow in a warm block and water sufficiently during cob formation. Separate popcorn and sweetcorn by flowering time or distance if needed.
Let kernels ripen on the plant and dry further under shelter. Test only after drying; milk-stage kernels do not make popcorn.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Traditional grain maize from Switzerland's Ticino region, with very dark, almost black kernels and sturdy plants.
Choose this type if you want to try growing a dry grain crop. A named sweetcorn variety makes more sense for sweet cobs to cook straight away.
No distinctive flavour is established. This is maize for ripe, dry kernels, not guaranteed sweet, fresh table corn.
This flavour description applies to the crop; there is no separate tasting result for this variety.Have dry kernels milled appropriately for a maize use. The colour makes the result unusual, but does not replace a suitable flour or cooking recipe.
Provide a spacious, sunny block and a season long enough for grain ripening. Swiss origin is not evidence of a guaranteed harvest in every Dutch garden.
Harvest when kernels ripen and harden, then dry cobs further with airflow. Store only completely dry, undamaged produce.
Also listed as: korrelmaïs “Zwart uit Ticino”.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Each cob has its own mosaic of glossy, coloured kernels: this maize is mainly a dry grain and popcorn selection.
Choose Glass Gem for surprising cob colours and a harvest lasting beyond summer. It does not replace sweetcorn.
The custodian describes maize flavour, not a sweetcorn profile. Glass Gem is usually popped or processed into maize meal.
Pop a small trial batch of well-dried kernels or have them suitably ground for maize meal. Do not automatically serve it as a fresh sweet cob.
Provide a warm, sunny block and plenty of space: the plants can grow tall. American maturity days are not a fixed Dutch harvest date.
Wait for dry, brown cob leaves for full colour, then continue drying the cobs in airy conditions. Popcorn quality also depends on drying.
Read the source notes →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A very old, white sweetcorn with cobs around 20 cm long on tall plants: a pale counterpart to Golden Bantam.
Choose Stowells Evergreen for white sweetcorn and large plants. It needs more vertical space than low vegetables alongside it.
The grower describes juicy white kernels with a fine flavour. A fixed sweetness ranking against other varieties is not given.
Boil or grill young cobs and taste the white kernels fresh. Cut kernels off for a simple warm vegetable dish.
Provide a spacious, sunny block; the producer states approximately 2.5–3 metres in height. Position the crop so its shade does not deprive smaller crops of light.
Pick milk-stage cobs for fresh eating. Keep this separate from fully dry kernels and prevent tall plants falling over.
Read the source notes →From a garden bed to a suitable pot or support: give your plant a place that suits your garden and the care you can provide.
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
Several adjacent rows help pollen reach the silks on the cobs.
For a garden with enough room and no nearby maize flowering at the same time.
Tick off your supplies →
This image was created with AI from described plant characteristics and growing advice. It shows a possible situation and is not a photograph of a verified cultivar.
A spacious raised bed makes soil and watering manageable, provided the block contains enough plants.
For a genuinely spacious raised bed; one balcony pot does not provide a reliable pollination block.
Tick off your supplies →Popcorn grows for hard ripe kernels bursting under heat; sweetcorn is harvested younger for juicy cobs. Choose varieties with time to ripen locally. American growing-day counts compare but guarantee no Dutch date. Start manageable, clearly labelled blocks.
University advice favours direct sowing. Cold wet soil can fail seed. About 16 °C soil temperature is a useful Minnesota starting point; check subsequent forecasts too. Use variety depth and spacing and thin crowded blocks.
Maize is pollinated by wind and gravity. Pollen from the tassel at the top must reach the silks on the cobs. A block of at least four rows gives more opportunities than a single row. Each successful connection can form a kernel. Gaps in a cob may therefore relate to pollination, as well as other growing problems.
Popcorn and sweetcorn cross-pollinate, affecting harvest quality. American sources suggest about 90 metres separation; large fields need extra attention. Flowering-time separation also works, but weeks between sowing do not guarantee bloom separation. Check actual tassels and silks or choose one type.
Remove weeds while young, working shallowly without damaging roots. During drought, water so it reaches the root zone, especially as flowers and cobs develop. Feed according to soil and product. Do not stop once a small cob is visible: kernels still need to fill. Drying starts only with fully developed, ripe cobs.
Birds may be involved when seeds or seedlings disappear; temporary protection belongs alongside a clear, well-tended start. For poorly filled cobs, consider pollination and drought stress. Examine unusual swellings or affected cobs carefully and keep damaged material separate. Do not automatically adopt American pesticide advice in a Dutch garden.
Leave the cobs outside to dry further for as long as conditions allow. Ripe kernels feel hard and the husks become dry. In prolonged wet weather, bring ripe cobs under cover to continue drying. Remove the husks and hang the cobs in airy mesh bags, protected from animals. Avoid a damp pile where mould can develop.
Pop a small trial batch weekly. Tough or poorly expanded popcorn may still be too moist; kernels must not dry completely either. Once most pop lightly and crisply, remove the rest from cobs and store airtight. Record drying time and results for a useful kitchen experiment.
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SeedSteps editorial team · updated on 11 October 2026. The AI images illustrate species and practical growing situations; they do not prove an exact cultivar, observations from your own garden or yield.
Britse gewasadviezen worden gecombineerd met Nederlandse en Vlaamse informatie waar beschikbaar. Amerikaanse Extension-bronnen ondersteunen plantprincipes en herkenning; hun kalenderdata, lokale plaagdruk, bestrijdingsmiddelen en mestdoseringen worden niet rechtstreeks op Nederland of Vlaanderen toegepast. Vorst, bodemwarmte, standplaats en expliciete rasinformatie blijven de lokale controle. Commerciële bronnen onderbouwen uitsluitend benoemde ras- en plantkenmerken; zij zijn geen affiliate-aanbeveling.
Supporting evidence by chapter: Choose popcorn maize with enough time to ripen: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. Sow directly when soil is warm enough: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. A block works better than one long row: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. Consider other maize in the area: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. Water during the green growing stage: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. Assess emergence and cob formation separately: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. Let ripe grains become dry and hard: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension. A small trial determines when to store: University of Minnesota Extension, Iowa State University Extension, Utah State University Extension.