Ida D. Bennett, The Busy Woman's Garden Book
“ Sea Kale, less well known than the annual kale, is a hardy perennial that is cultivated somewhat like asparagus, the seed being sown in the spring in rows three to four feet apart. The seedlings give a crop the third year but quicker results come from planting root cuttings or offsets. The Sea Kale has a very long tap-root and should be grown in rich mellow soil that has been ploughed or dug very deep. As soon as shoots show above the ground blanch with boards, earth, sand or anything that will exclude light until ready for use. ”
