Swedes are hardy brassicas valued for substantial, sweet yellow-fleshed roots that stand well through autumn and winter. They are a worthwhile allotment crop, occupying ground for several months but rewarding patience with dependable lifting in cold weather. Frost often improves their flavour.

When and how to sow

Sow thinly direct from May to June in firm, fertile soil, removing stones and clods so roots develop smoothly. Cover seed lightly and keep the surface moist until seedlings emerge. Thin gradually until plants stand about 23 cm apart. Grow in an open site and rotate away from previous brassica ground. 'Marian' is a useful variety with some club root resistance.

Care

Water during prolonged dry spells to prevent woody or split roots, and keep rows free from weeds while plants establish. Draw a little soil around exposed shoulders if needed. Avoid excessive feeding, which can favour leafy growth over roots. A light mulch helps conserve moisture. Leave mature plants outside through cool weather for improved flavour.

Common problems

Flea beetles can pepper seedlings with holes, so cover young rows with fleece. Club root causes stunted, swollen roots and is best managed by brassica rotation and well-drained soil. Powdery mildew may affect older foliage in dry weather; remove badly affected leaves and avoid crowding plants. Clear crop debris after lifting.

Harvest

Lift swedes from autumn onwards, using a fork to loosen soil before pulling the roots. Frost sweetens their flavour, and plants can remain in the ground through winter if soil is workable. Trim foliage after lifting. Store sound, unwashed roots in a cool, dark, frost-free place, or lift only what the kitchen needs.

Growing Swede: frequently asked questions

When should I sow swede in the UK?

Sow thinly direct from May to June in firm, fertile soil, removing stones and clods so roots develop smoothly.

What are common problems when growing swede?

Flea beetles can pepper seedlings with holes, so cover young rows with fleece.

When is swede ready to harvest?

Lift swedes from autumn onwards, using a fork to loosen soil before pulling the roots.

General guidance for UK home gardens and allotments. Reference figures are typical values; your exact timing depends on your region, last-frost date and variety. Page updated 19 Sep 2026.