sweet corn

Also known as: corn; Guinea wheat; Indian corn; maize; mealies; ornamental maize; Turkey wheat

Sweetcorn is relatively easy to grow and without a doubt tastes so much better that shop bought. There's a great range of varieties to grow, both heritage and modern, and something to suit most gardens and the shorter British summers. If you are short on space you could also try growing baby corn. Sweetcorn is generally classified into three groups. 'Normal' which is the original type of sweetcorn and seeds tend to have the most vigour - they're not as sweet as some of the newer varieties and should be eaten as soon as picked to avoid the sugar being converted to starch. 'Supersweet' which, as the name suggests, have a high sugar content but are not so easy to germinate. 'Supersweet' varieties should not be grown with other varieties as cross-pollination can result in a reduction in sugar content. 'Tendersweet' which are both tender and sweet (although not as sweet as 'supersweet') and can be grown alongside other varieties.

sweet corn

Scientific classification

Species
sweet corn (Zea mays)
Genus
Zea
Family
Poaceae
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Toxicity
Annual Biennial
Plant type
1.5-2.5 metres
Height
0.5-1 metres
Spread
Deciduous
Foliage
Columnar upright
Habit
Spring · Summer · Autumn
Season of interest
Full sun
Sunlight
20 – 30 °C
Ideal temperature

sweet corn pictures

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Distribution of sweet corn

Distribution map

Plant distribution
  • Native
  • Introduced
  • Cultivated

Source:WCVP v16 · Royal Botanic Gardens, Kew · CC BY 3.0 · Boundaries:WGSRPD / TDWG

Culture

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Toxicity

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Quick identification of sweet corn

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sweet corn care guide

Keep soil evenly moist, especially during rapid summer growth
Watering
Full sun
Sunlight
20 – 30 °C
Ideal temperature

Watering

Keep soil evenly moist, especially during rapid summer growth

Fertilizing

Nitrogen-rich feed early, then balanced feed before tasseling

Pruning

No pruning required.

Propagation

Sow seeds undercover from mid-spring in pots or modules and then plant out May - June after hardening off and the last of the frosts have passed. Alternatively sow 'in situ' from late spring to early summer. Always plant in a grid pattern to ensure pollination. See sowing vegetable seeds

Growing

Grow in a sunny, sheltered spot in soil that has been enriched with well-rotted organic matter. Sweetcorn can tolerate many soil types but prefers well-drained soils with a pH between 5.5 and 7.0. Harvest from July to October. See sweetcorn cultivation for futher information.

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People also ask

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Common pests and diseases

Diseases

May be susceptible to smuts which apppear as large galls on the cobs and stalks in hot weather.

Pests

May be susceptible to damage from birds, slugs, mice and badgers.

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