Easily grown in organically rich, consistently moist, well-drained loams in full sun. ‘Redbor’ is an ornamental kale with purple-red leaves. It is best grown in the cool temperatures of fall. It needs cool temperatures to produce the deep red leaf color characteristic of the plant. It may also be grown in early spring. If grown in summer, however, plants will need some afternoon shade, perhaps to survive, but the foliage will fail to produce good leaf color due to the absence of cool temperatures. Plants generally grow poorly when daytime temperatures begin to consistently exceed 80 degrees F. ‘Redbor’ may be grown from seed or plants may be purchased from nurseries. For spring plantings, sow seed indoors about 6-8 weeks prior to last spring frost date. In the alternative, transplants may be purchased from local nurseries. In either case, the seedlings/transplants should be planted in the garden about 1-2 weeks prior to last spring frost date. For fall plantings, sow seed indoors in early July and plant the seedlings in the garden in mid-August. Plants will typically provide excellent deep red foliage well into fall including through several frosts. Depending on temperatures, plants may survive to Thanksgiving or into December in some years. In mild winter climates, plants often survive winter and remain attractive until they bolt in spring. Apply mulch around plants to protect the shallow roots, reduce weeds and retain soil moisture. Rotate crops to avoid soil borne diseases. Plants may also be grown in containers.
Brassica oleracea (Acephala Group), commonly called kale, is a cool weather vegetable that is grown for harvest of its edible leaves. Although very similar to cabbage, kale is distinguished by having loose, upright, wavy-edged leaves that do not form a head (acephala from Greek means headless). Cabbage forms heads. Acephala Group also includes genetically similar spring greens and collard greens.
Kale belongs to the Brassica family which includes other cool season vegetables such as cabbage, Brussels sprouts, broccoli, cauliflower and kohlrabi.
'Redbor' features purple-red leaves. It is primarily grown in gardens as an ornamental foliage plant rather than as a vegetable. The curled purple-red leaves with silver tones add intense color, texture and interest to garden areas. It is a biennial that is grown in St. Louis as an annual. Plants will grow to 18" tall. Plants need the cool weather of spring or fall to develop their best foliage color. As night temperatures drop during the fall, the leaf color of ‘Redbor’ darkens and intensifies.
Watch for cabbage worms, cabbage loopers, flea beetles, caterpillars, thrips, slugs and aphids. Root maggots may be a problem in some areas. Potential disease problems include leaf spots, blackleg, black rot and yellows.
Border fronts, ornamental garden areas, edging, window boxes, containers. Mix with chrysanthemums, grasses and asters. Leaves may be harvested as a vegetable, but taste is somewhat inferior to that of kales developed for vegetable gardens. Red leaves may be used as an attractive garnish.