Colewort (Crambe cordifolia) KRAM-bee kor-dih-FOE-lee-ah Genus:  Crambe This species is notable in stature, forming a giant mound and producing a profusion of airy white flowers on tall stems in late spring to midsummer and then dying down in midsummer to late summer. Colewort can reach 8 feet high and about half as wide. Grow in a large border or open woodland. Noteworthy Characteristics:  Large leaves and abundant flowers. Care:  Prefers fertile, well-drained soil in full sun, but will tolerate poorer soils in partial shade. It is susceptible to rot in moist soils, and may be short-lived. It tends to survive winters beyond Zone 6. Propagation:  Sow seed in a cold frame in spring or fall. Problems:  Clubroot, black rot, slugs, snails.

Overview

Height 6 ft. to 10 ft. Spread 3 ft. to 6 ft. Growth Habit Clumps Growth Pace Fast Grower Light Full Sun to Part Shade Moisture Dry to Medium Maintenance Low Characteristics Self Seeds, Showy Flowers, Showy Foliage Bloom Time Early Summer, Late Spring, Spring, Summer Flower Color White Uses Beds and Borders, Specimen Plant/Focal Point Style Cottage Garden Seasonal Interest Spring Interest Type Perennials