Celery is a rewarding but exacting crop for a productive allotment or kitchen garden. Traditional trench types are blanched for pale, tender stems, while self-blanching and leaf celery are simpler. All types need cool, uninterrupted growth and reliably moist, fertile ground.

When and how to sow

Sow tiny seeds on the surface of moist potting compost in module trays from March to April, keeping them warm and bright. Prepare a deeply dug bed enriched with garden compost, ideally in full sun. Harden seedlings off carefully, then plant after the last spring frost, spacing them 23 cm apart in blocks. In colder districts, wait until conditions are settled.

Care

Water frequently so the soil never dries out, and mulch to conserve moisture. Feed with a surface dressing of garden compost during growth and weed gently around shallow roots. For trench celery, earth soil up gradually or wrap stems while keeping the heart exposed; self-blanching plants need no elaborate blanching.

Common problems

Slugs can damage young plants, so inspect regularly and remove hiding places. Celery leaf miner leaves pale tunnels in foliage; pick off affected leaves promptly. Any cold, drought or transplanting check may cause bolting, so harden plants off gradually and maintain steady moisture throughout.

Harvest

Cut whole plants from late summer through autumn when stems are thick, crisp and well developed, or take a few outer stalks at a time from leaf celery. Lift before severe frost. Trim damaged leaves and keep harvested stems cool, using them promptly for best flavour and texture.

Growing Celery: frequently asked questions

When should I sow celery in the UK?

Sow tiny seeds on the surface of moist potting compost in module trays from March to April, keeping them warm and bright.

What are common problems when growing celery?

Slugs can damage young plants, so inspect regularly and remove hiding places.

When is celery ready to harvest?

Cut whole plants from late summer through autumn when stems are thick, crisp and well developed, or take a few outer stalks at a time from leaf celery.

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.