When to plant Celery in Liverpool

Sow seeds thinly around 14th February - 5th 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 7th 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 28th March. 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 2nd 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 30th April 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 30th April and keep going to 12th November. 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 23rd July once the plants are well filled out. Harvest over 23rd July - 12th November by taking what you need from each plant, or lift whole plants when they are fully sized before cold weather slows them down.