Sow seed from April to July in a sunny position in fertile soil. Sow seed thinly, 2cm (¾in) deep, in rows 30-38cm (12-15in) apart; the wider distance is best for semi-mature to full-size heads.
Earlier and later sowings for baby leaf can also be made under cloches or fleece in mild areas.
Gradually thin seedlings to 7.5-10cm (3-4in) for baby leaf, to 20cm (8in) for semi-mature plants and to 25-30cm (10-12in) for mature plants. The thinnings can be eaten.
Keep plants well watered throughout the growing period to avoid bolting (running to seed) and lack of flavour.
Flea beetle: Leaves are covered in small holes and damaged areas turn brown. Seedlings are particularly susceptible.
Remedy: Grow plants under horticultural fleece and keep the soil moist. Water in nitrogen-rich fertilser to help the crop outgrow the pest.
More info on Flea beetle
Powdery Mildew: Appears as a white powdery deposit over the leaf surface and leaves become stunted and shrivel.
Remedy: Keep the soil moist and grow in cooler locations.
More info on Powdery Mildew
Bolting: Plants flower and set seed prematurely.
Remedy: Unless growing for seed sow bolt-resistant varieties. Sow or plant at the correct time and keep the soil or compost moist.
More info on Bolting
It is ready to harvest in 30 days from sowing as baby leaf, or between 45-75 days as semi-mature to full-size heads.
Harvest as and when needed.
Joi Choi:Is slow to bolt and has good frost resistance.
Canton Dwarf:Is compact with dark green leaves.
Buy pak choi