Corn, Sweet
Zea mays
Sweet corn is a warm-season crop that needs block planting for wind pollination, deep roots, and full sun with eight hours of direct light preferred. Ears fill best when nights stay warm and plants receive even moisture through silking and kernel development. Direct seed goes out about one to three weeks after the last spring frost when soil is warm.
Plant family Poaceae · Also called sweetcorn, maize
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Plant blocks after soil warms.
Direct sow about 3.8 cm deep once soil warms, from one to three weeks after the last spring frost. Tender classification rules out early cold sowings.
Germination is typically 7–10 days. Succession every 14 days can spread harvest if the season is long enough, though each block still needs simultaneous pollen shed for full ears.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Use this range as a planning baseline and adjust for local conditions.
Lay out rows for pollination, not isolation.
Plant 20–30 cm apart in rows 75 cm apart, but arrange multiple short rows as a block rather than one long line. Large space need reflects height and root spread.
Containers are challenging: minimum 30 cm depth and about 60 litres are listed, yet pollination still requires several plants flowering together.
Core measurements
Crop-level planning range.
Crop-level planning range.
Crop-level planning range.
Crop-level planning range.
Allow for the mature form of the selected variety.
Install support early when it is required or useful.
Water deeply when silks appear.
Eight hours of direct sun is preferred. Corn is inefficient in shade; weak photosynthesis shows up as thin ears and poor kernel fill.
Moderate water at 25–35 mm weekly with pH 5.8–7.0. Silking and tasseling are critical moisture windows; stress then produces skipped kernels on the cob.
Sunlight
Full sun preferred (8+ direct-sun hours/day)
Soil pH
A suitable acidity range for general growth.
Weekly water
Moderate water need.
Aim for even moisture and water deeply when the upper 2-3 cm of soil begins to dry.
Pick when kernels read ripe.
The 60–100 day range begins at sowing. Pick when silks brown and kernels release milky juice when pierced; timing varies by hybrid within the band.
Each stalk usually bears one primary ear worth harvesting. Staggered sowings align with the succession interval but still require warm nights for acceptable sweetness.
Read with the full crop profile.
Read with the full crop profile.
Read with the full crop profile.
Read with the full crop profile.
Plant in blocks rather than a single row so wind pollination is more reliable.
Corn, Sweet growing questions
Why plant corn in blocks instead of one row?
Wind pollination improves when many plants shed pollen nearby. The key tip recommends blocks over a single row.
How deep is sweet corn seed planted?
About 3.8 cm deep per the dataset, deeper than many vegetables because of seed size.
Can sweet corn be started indoors?
This profile lists direct sowing only, with outdoor timing one to three weeks after the last frost.
What container volume is listed for sweet corn?
At least 60 litres with 30 cm depth, though home pollination still needs multiple plants.
Profile values are crop-level planning ranges compiled from sources S1,S2,S4. Local climate and variety can change actual results.
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