Plant Profile

Sweet cornZea mays Saccharata Group

Sweet corn is a rewarding summer crop that delivers an unmatched sweetness when harvested fresh from the garden. Because its sugars rapidly convert to starch after picking, home growing is the definitive way to experience true sweet corn. For successful pollination, always plant corn in block formations.

Vegetables Fruit vegetables Grasses

Calendar

Sweet corn: plant portrait. harvest: August - October.

Quick profile

Key data

Growing calendar

JanFebMarAprMayJunJulAugSepOctNovDec

Indoor sowing

Direct sowing outdoors

Planting outdoors

Harvest

Pruning

Indoor sowingDirect sowing outdoorsPlanting outdoorsHarvestPruning

Suitable growing locations:

Outdoor garden bed Raised bed

Good neighbors

Climbing beanSquashCucumber

Avoid

PotatoBeetroot

Indoor & direct sowing

Sweet corn: Sowing and germination

Indoor sowing

Pre-culture in pots from mid-April indoors or in a greenhouse.

Direct sowing outdoors

Direct outdoor sowing from mid-May after the last frost, once the soil has warmed up.

Seed depth2 - 4 cm

Germination temp12 - 25 °C

Germination time7 - 14 days

Light germinatorNo

Dark germinatorYes

Cold germinatorNo

Stratification neededNo

Pre-soaking recommendedYes

Planting & site

Sweet corn: Planting and spacing

Planting outdoors

Planting out pre-cultivated seedlings from mid-May in a block formation.

Plant spacing25 - 35 cm

Row spacing45 - 60 cm

Plants per m²6 - 8 per m²

Bed widthfrom 120 cm

Site & practical notes

Pro tips: Hill up the soil around the base when plants are 30-40 cm tall. This stimulates stabilizing prop roots and prevents lodging during summer storms., Never plant sweet corn close to field corn; wind cross-pollination will render your sweet corn kernels starchy and flavorless.

Temperature & frost

Sweet corn: Temperature and site

Growing temperaturefrom 10 °C

Optimal temperature18 - 28 °C

Max. heatup to 38 °C

Soil temperature12 - 18 °C

Frost sensitiveYes

Late frost sensitiveYes

Heat tolerancehigh

Cold tolerancelow

Water & nutrients

Sweet corn: Water, nutrients and care

Waterhigh

Critical water phasesFlowering stage, Cob development

Watering methodGround-level watering or drip irrigation

Droughthigh

Waterlogging sensitiveYes

Mulching recommendedYes

Nutrient needheavy feeder

Compost recommendedYes

Fertilizer sensitivitymedium

Container & growth

Sweet corn: Container, support and growth

Container suitableNo

Pot sizeVolume: from 40 l; Recommended: from 60 l; Diameter: from 40 cm; Depth: from 40 cm

SupportNo

Height150 - 220 cm

Width30 - 50 cm

Root depth40 - 100 cm

Root spread30 - 50 cm

Yield1 - 3 cobs

Year plan

Sweet corn Calendar

Plants

When the brown silks flutter in midsummer, the moment of truth for wind pollination has officially arrived.

Year overview

JanFebMarAprMayJunJulAugSepOctNovDec

Indoor sowing

Direct sowing outdoors

Planting outdoors

Harvest

Pruning

Recurring tasks

Removal of excessive basal tillers if desiredJune - July

Should be done carefully to avoid mechanical weakening or creating entry points for fungi.

Relevant now

June

No additional single task

Next up

July

Additional watering during floweringWater deficiency during flowering and ear formation leads to poorly filled cobs.

Monthly tasks

Single tasks from monthly data; repeated seasonal windows are shown in the overview above.

Quiet month

Flowering & pollination

Sweet corn Flowering & pollination

Flowering period

Months: 7, 8, Notes: The main flowering period occurs in July and August. Male flowers are located at the top of the stalk, while female flowers develop in the leaf axils.

Self-fertility

self-fertile, cross-pollination beneficial

Pollinator needed

Overview

Sweet corn is a wind-pollinated, cross-pollinating plant. Pollen from the top tassels is carried by the wind to the sticky silks of the lower developing ears.

Notes

Insects are not required. Because wind carries the pollen, block planting (at least 3x3 or 4x4 plants) is essential to ensure full kernel development.

Pruning & care

Sweet corn Pruning & care

Pruning timing

Summer

Removal of excessive basal tillers if desired Should be done carefully to avoid mechanical weakening or creating entry points for fungi.

Remove

Side tillers at the base can optionally be removed, though this is generally not strictly necessary for home gardeners.

Preserve

Avoid

Tools and hygiene

If knives or pruners are used to cut away smut galls, they must be thoroughly disinfected immediately afterward.

Companion guide

Sweet corn Companion guide

Companion guide

Good neighbors

Climbing beanSquashCucumber

Avoid

PotatoBeetroot

Use & storage

Sweet corn Use & storage

Harvest

Harvest when the silks turn brown and dry, and the kernels exude a milky liquid when pressed.

Storage

Short-term fresh storage or immediate preservation.

Storage life

Fresh 2-3 days; blanched and frozen or canned up to 12 months.

Harvest

Harvest when the silks turn brown and dry, and the kernels exude a milky liquid when pressed.

Processing

After harvest

After harvest, sugars in the kernels quickly convert to starch. Cool the cobs immediately and ideally consume or process them on the same day.

Edibility & safety

Sweet corn Edibility & safety

For people

In brief: which parts are edible, which parts remain risky, and whether raw consumption makes sense.

Edible parts:Kernels (seeds), Young, immature ears (baby corn)

Caution parts:Husks, Stalks, Dried silks, Central cob core

Raw consumption:During the milky stage, the sweet, juicy kernels can be eaten raw directly off the cob in the garden.

Safety notes

Sweet corn is completely non-toxic. Caution with corn smut (Ustilago maydis) infection: the galls are a delicacy in Mexico (huitlacoche), but should be avoided if unfamiliar.

Animal safety

For many animals, this plant is generally low-risk: 14 animal types are rated suitable or mostly suitable. Quantity, plant part, and individual tolerance still matter.

Animal safety by plant part

Each row shows which parts are more suitable and which parts are critical.

Companion animals

Dog

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Digestive upset from excessive fiber or immature parts consumption, Risk of corn smut (Ustilago maydis) if mishandled

Symptoms

Vomiting, Diarrhea

observe

Sweet corn is non-toxic to dogs, but only the kernels and young ears should be fed in moderation. Other plant parts are difficult to digest and may cause gastrointestinal upset. Corn cobs pose a choking hazard. Moldy corn should be avoided due to potential mycotoxins.

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Cat

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Excessive consumption of corn cobs or leaves may cause gastrointestinal upset., Corn cobs can pose a choking hazard., Avoid moldy or spoiled corn.

Symptoms

Vomiting, Diarrhea

observe

Sweet corn is generally non-toxic to cats, but only the kernels and young ears should be given in small amounts as treats. Other plant parts are difficult to digest and may cause gastrointestinal upset. Corn cobs pose a choking hazard. Moldy corn should be avoided due to potential mycotoxins.

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Rabbit

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption can cause bloating and digestive upset due to high starch and sugar content., Non-edible parts like leaves and stalks are difficult to digest and may cause intestinal blockages.

observe

Sweet corn is non-toxic to rabbits but should only be given in small amounts as a treat due to high sugar content. Non-edible parts should be avoided.

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Guinea pig

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overfeeding may cause digestive upset due to high starch and sugar content

observe

The edible parts (kernels and young ears) are suitable for guinea pigs in small amounts as a treat. The indigestible plant parts such as leaves, stalks, and dried silks should be avoided as they can cause digestive issues. Corn is not a natural part of the guinea pig diet and should only be fed occasionally. In case of corn smut (Ustilago maydis) infection, the entire plant should be avoided.

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Hamster

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overfeeding can cause digestive issues due to high starch and sugar content., Inedible parts like leaves and stalks are difficult to digest and may cause intestinal blockages.

observe

Sweet corn kernels are suitable for hamsters in small amounts as a treat, but not as staple feed. The inedible parts of the corn cob should be avoided.

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Budgie

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and sugar content., Kernels may pose a choking hazard for small birds like budgies if not properly prepared.

observe

Budgies can safely eat the sweet kernels of sweet corn as an occasional treat. Other parts of the plant are not toxic but are difficult to digest and should be avoided. Overconsumption may cause gastrointestinal upset. Kernels should be appropriately sized to prevent choking.

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Farm animals

Horse

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high starch and cellulose content., Kernels should be removed from the cob to prevent choking hazard.

observe

Sweet corn is non-toxic to horses, but only the kernels and young ears should be fed in moderation. Other plant parts are poorly digestible and can cause gastrointestinal issues or obstructions. Suitable as part of a balanced ration.

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Chicken

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and cellulose content in indigestible parts.

observe

Sweet corn kernels are suitable for chickens in moderation as an occasional treat. Other plant parts are difficult to digest and should be avoided. Corn smut (Ustilago maydis) should be avoided.

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Duck

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and sugar content., Immature or moldy kernels should be avoided.

usually no action needed

Sweet corn is generally non-toxic for ducks, but only the edible parts (kernels and young ears) should be fed in moderation. Other plant parts are difficult to digest and may cause gastrointestinal upset. Corn smut (Ustilago maydis) should be avoided due to potential intolerance.

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Goose

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and sugar content., Immature or moldy kernels should be avoided.

usually no action needed

No direct species-specific source was found for geese. This is a cautious inference from the ducks profile and the known plant-part risks.

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Sheep

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and starch content., Indigestible parts like cobs and stalks can cause obstructions.

observe

No direct species-specific source was found for sheep. This is a cautious inference from the cattle profile and the known plant-part risks.

Open animal page

Goat

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and starch content., Indigestible parts like cobs and stalks can cause obstructions.

observe

No direct species-specific source was found for goats. This is a cautious inference from the sheep profile and the known plant-part risks.

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Cattle

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overconsumption may cause digestive upset due to high fiber and starch content., Indigestible parts like cobs and stalks can cause obstructions.

observe

Sweet corn is non-toxic to cattle, but only the kernels and young ears should be fed. Other plant parts are poorly digestible and can cause gastrointestinal issues or obstructions. Suitable as part of a balanced ration in moderation.

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Pig

Kernels (seeds), Young, immature ears (baby corn)

Husks, Stalks, Dried silks

Risk factors

Overfeeding can cause digestive upset, Indigestible fiber in stalks and leaves can cause obstructions

observe

Sweet corn kernels are suitable for pigs in moderation as an occasional treat. Other plant parts are poorly digestible and can cause gastrointestinal issues or obstructions. Corn smut (Ustilago maydis) should be avoided.

Open animal page

These guidelines are for general information only and do not replace veterinary diagnosis. If critical plant parts were ingested or the animal shows unusual behaviour or symptoms, seek veterinary advice.

Max risk

unknown

Highest status

moderation only

Urgency

observe

Saving seed

Sweet corn Saving seed

Seed viability

2 - 4 years

Notes

Ensure open-pollinated varieties are used. Many modern sweet corns are F1 hybrids which do not breed true. Cross-pollinates extremely easily with field corn or popcorn over long distances.

Practical tips

Sweet corn Practical tips

Common beginner mistakes

Success pattern

Block planting in full sun, heavy compost application in May, and drip irrigation during the midsummer flowering window.

High-impact tips

Mulch heavily around these hungry stalks to lock in moisture and suppress weed competition with minimal effort.

Grower observations

In windy Central European regions, hilling up stalks once they reach knee height is a lifesaver against storm damage.

Plant Profile

Additional plant images

Health

Pests, Diseases

Plant health

Diagnosis help

Sweet corn Diagnosis help

Pest groups

Disease groups

Prevention

Diagnosis

Regularly check leaf axils and stalks for borer holes, and check ear tips for caterpillar feeding.

Cultural prevention

Monitoring

First response

Diagnostic rules

Kernels on the cob are partially missing or the ear is mostly bare.

Possible causes: Poor pollination

Was the corn planted in a block rather than a single row?
Was there extreme water stress or heat during the flowering phase?

Leaves show a distinct reddish-purple discoloration during the early growth stage.

Possible causes: Phosphorus deficiency

Are current temperatures very low (below 10-12°C)?
Is the soil heavily compacted or too wet?

FAQ

Why does my corn cob have missing or uneven kernels?

This is almost always due to poor pollination. Planting corn in a single long row instead of a block causes wind to blow pollen away from the silks. Severe drought during flowering can also dry out the sticky silks prematurely.

Can you eat sweet corn raw straight from the garden?

Yes, absolutely. At the peak milky stage, fresh sweet corn is crisp, juicy, and wonderfully sweet. Cooking is completely optional.

Is Sweet corn safe for Dog?

Sweet corn is classified as moderation only for Dog. Risk: unknown. Urgency: observe. Sweet corn is non-toxic to dogs, but only the kernels and young ears should be fed in moderation. Other plant parts are difficult to digest and may cause gastrointestinal upset. Corn cobs pose a choking hazard. Moldy corn should be avoided due to potential mycotoxins.

Is Sweet corn safe for Cat?

Sweet corn is classified as moderation only for Cat. Risk: unknown. Urgency: observe. Sweet corn is generally non-toxic to cats, but only the kernels and young ears should be given in small amounts as treats. Other plant parts are difficult to digest and may cause gastrointestinal upset. Corn cobs pose a choking hazard. Moldy corn should be avoided due to potential mycotoxins.

Is Sweet corn safe for Rabbit?

Sweet corn is classified as moderation only for Rabbit. Risk: unknown. Urgency: observe. Sweet corn is non-toxic to rabbits but should only be given in small amounts as a treat due to high sugar content. Non-edible parts should be avoided.

Is Sweet corn safe for Guinea pig?

Sweet corn is classified as moderation only for Guinea pig. Risk: unknown. Urgency: observe. The edible parts (kernels and young ears) are suitable for guinea pigs in small amounts as a treat. The indigestible plant parts such as leaves, stalks, and dried silks should be avoided as they can cause digestive issues. Corn is not a natural part of the guinea pig diet and should only be fed occasionally. In case of corn smut (Ustilago maydis) infection, the entire plant should be avoided.

Internal links

Related plants

Calendar

Climbing bean

Related crops

Classic structural partner in the traditional Milpa companion planting system.

Other grasses

Same family

Rarely grown as annual vegetables; includes standard cereal crops like wheat, barley, and oats.

Sunflower

Similar uses

Grows to a similar height and can also serve as a sturdy natural trellis for climbing beans.

Field corn / Flint corn

Often confused with

Young plants look identical, but field corn accumulates starch instead of sugars and lacks sweetness.

Popcorn

Often confused with

Belongs to the same species but produces hard, small kernels with a tough hull designed for popping, not fresh consumption.

Vegetables Fruit vegetables Grasses

Sources

Public sources

Wikidata entity
Wikidata · 2026-05-16
GBIF species match
GBIF · 2026-05-16
Deutschsprachige Wikipedia: Zuckermais
Wikipedia · 2026-05-16
English Wikipedia: Sweet corn
Wikipedia · 2026-05-16