Sweetcorn Growing Guide

Zea mays convar. Saccharata


Crop Rotation Group



Warmed, well-drained soil enriched with compost.


Full sun.

Frost tolerant



Not usually required.


Single Plants: 35cm (1' 1") each way (minimum)
Rows: 30cm (11") with 45cm (1' 5") row gap (minimum)

Sow and Plant

Frost areas: sow under cover 6 weeks before last spring frost. Plant out in late spring, when the weather is settled and warm. Frost free areas: Sow seed directly or in seed beds/seed trays in late spring
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.


Plant in blocks of at least 9 plants, all the same variety, to encourage pollination by the wind. Often planted with squash as they like similar conditions. Keep well watered in dry spells.


Harvest just before eating to get the sweetest taste, when the tassels at the top of the cobs turn brown to black. You can peel back the leaves and check the corn: if they ooze milky sap when pressed with a fingernail then they are ready.

Planting and Harvesting Calendar

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Pests which Affect Sweetcorn

Plant Diseases which Affect Sweetcorn