SOW & GROW : from March to May, starting in pots or modules at 10-15mm deep and planting out when large enough to handle after hardening off.  Space at 30-40cm apart.  Ready to harvest from August Sowing: Sow successionally from July to September, nearly all brassicas should be planted in a seedbed or in modules under glass and then transferred. Seeds should be sown thinly, as this reduces the amount of future thinning necessary and potential risk from pests. Sow seeds 12mm (½in) deep and space 15 to 20cm (6 to 8in) between rows. Once the seeds have germinated, thin the seedlings to 7.5cm (3in) between each plant. After germination, seedlings will often be ‘leggy’, so plant them as deep as possible to really anchor them into the soil. Cabbage seedlings are ready for transplanting when they are between 6 and 8cm high (2½ to 3in). Water the day before moving, and keep well-watered until established. Plant firmly, close together for small heads and wider apart for larger cabbages, around 30 to 45cm (12 to 18in) apart. To grow spring greens, plant out to 15cm (6in) apart and take alternative plants in March as spring greens leaving the others to fully mature fully. Growing; Clear away any yellow leaves. Feed the plants as they near maturity with a foliar feed. Water regularly, especially in dry periods. Hoe between plants as required. Harvest; April to May. Earliest heads can be cut, leaving the stump in the ground to produce a second crop of small leafy heads.