When to plant Calabrese in Liverpool

Sow seeds directly into prepared soil from 16th April - 16th May. Make drills 1 cm deep and space seeds 5 cm apart, thinning later. Cover lightly with soil and water well. Sow a new batch every 21 days across the displayed sowing window for a steadier crop.

Thin seedlings to the final spacing of 45 cm apart once they have two true leaves, around 30th April - 6th June. Remove the weakest plants, leaving the strongest to grow. Water after thinning to help the remaining plants establish.

Protect plants from pests as they grow from 7th May - 13th June. Use fine mesh netting to cover the bed, securing it well to keep out butterflies and birds. Add brassica collars to each plant to prevent root fly damage.

Apply a nitrogen-rich fertiliser every 28 days from 14th May to encourage growth. Use a liquid feed or granular fertiliser, watering it in thoroughly. Discontinue feeding when the central head begins to form.

Cut the main head when it's compact and before the flowers open, from 25th June. Harvest side shoots regularly as they develop until 12th November. Keep the soil moist to reduce the risk of bolting during dry spells.