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

Sow in pots under cover in mid spring and plant out in early summer. Alternatively sow direct under cloches in late spring.
Our Garden Planner can produce a personalized 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 tassles 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