Sow seeds from April to early June. Sow seeds thinly in a well prepared seed bed, 12mm (1/2") deep in drills 23cm (9in) apart.
Transplant when large enough to handle, about 5 weeks from sowing, to 50cm (20in) between plants each way. Plant firmly and keep well watered until established. Prefers a well drained, moist, rich soil. Fleece against caterpillar and aphid as necessary, and net against pigeons during the winter.
Water Kalettes® regularly and do not allow them to dry out as this may impair their development. Hoe between plants regularly to prevent weeds from establishing and bring insect larvae to the surface. Remove any yellowed or diseased leaves as they occur. Sprouts can be harvested from early autumn through to late winter.