Produces a mound of loose, oak leaf shaped leaves for regular picking for several weeks. Does not produce a solid heart. Good resistance to bolting (running to seed).Sow thinly, 1cm (½in) deep in drills 30cm (12in) apart in soil which has been raked to a fine tilth. Water ground regularly, especially during dry periods.When large enough to handle, thin out seedlings to 30cm (12in) apart. Harvest as and when required.Lettuce is a good source of beta-carotene and vitamin A.