When to plant Celery in Durham

Sow seeds thinly around 10th March - 29th March on the surface of fine seed compost, then just cover with a light dusting of vermiculite. Keep them at 15–18 °C and never let the compost dry out.

Prick out seedlings once they are large enough to handle, from 31st March, and move each one into its own small pot. Keep the young plants growing steadily and water gently from below if possible.

Pot on when roots fill the small pots, from 21st April. Use a richer mix and keep the plants moving without checks, as stunted celery rarely recovers well.

Harden off over about 15 before planting out, from 26th April. Stand the plants outside in a sheltered spot by day and bring them back in at night at first, then leave them out for longer each day.

Plant out from 24th May into rich, moisture-retentive soil once the danger of frost has passed. Set plants 30 cm apart, water in thoroughly at once, and protect them with fleece or cloches if cold weather returns.

Start from 24th May and keep going to 16th October. Water deeply in dry spells and feed every 14 days with a balanced liquid feed to keep growth steady and stems crisp.

Cut the outer stems from 16th August once the plants are well filled out. Harvest over 16th August - 16th October by taking what you need from each plant, or lift whole plants when they are fully sized before cold weather slows them down.