Sow seeds in a well-prepared seed bed in mid to late spring in drills 12mm (½in) deep, spaced 30cm (12in) apart. When the seedlings have four or five leaves, transplant to their final quarters 75x75cm (30x30in) apart. They will grow in most soils but must be planted firmly. Water well until they become established. Harvest in January/mid February by snapping off the flowering shoots before the flowers open. Don't remove the large leaves as these will protect the next batch of shoots.