Crambe maritima is a PERENNIAL growing to 0.6 m by 0.6 m . It is hardy to zone 5 and is not frost tender. It is in flower from June to August. The species is hermaphrodite and is pollinated by Bees, flies. The plant is self-fertile. It is noted for attracting wildlife. Suitable for: light , medium and heavy soils and can grow in nutritionally poor soil. Suitable pH: neutral and basic soils and can grow in saline soils. It can grow in semi-shade or no shade. It prefers dry or moist soil and can tolerate drought. The plant can tolerate maritime exposure.
Coastal sands, shingle, rocks and cliffs near the sea, often on the drift line., Ground Cover, Cultivated Beds, Ground Cover, Cultivated Beds
An easily grown plant, succeeding in a good loam and an open sunny position but also tolerating some shade. Prefers a slightly alkaline soil in a position sheltered from strong winds . Tolerates poor soil and some shade. Dislikes acid and very stiff soils. Prefers a rich, well-drained very deep sandy loam and a pH of 7. Established plants are very drought tolerant. This species is hardy to about -20°c, it grows best in a cool maritime climate. Seakale is sometimes cultivated for its edible young shoots in the spring which are blanched by excluding light in order to make them less bitter. Two or three crops can usually be harvested each year. There are some named varieties. The roots are sometimes brought into a greenhouse in the winter and grown on there in order to produce an early crop of shoots. A deep-rooted and very long-lived plant, it dislikes root disturbance. The seed is dispersed by seawater, on which it can float for several days without loss of viability. A good bee plant. The plant is heat tolerant in zones 9 through 6. . At this temperature, many plants begin to suffer physiological damage. Heat Zones range from 1 to 12 . For example Heat Zone. 11-1 indicates that the plant is heat tolerant in zones 11 through 1.) For polyculture design as well as the above-ground architecture information on the habit and root pattern is also useful and given here if available. The plant growth habit is a clumper with limited spread . The root pattern is a tap root similar to a carrot going directly down .