Crambe cordifolia (Colewort): Giant Perennial for Dramatic Spring Blooms

For sheer architectural presence, few perennials match Crambe cordifolia (Colewort). This imposing plant forms a giant mound of large, coarse leaves, then sends up tall, branching stems frosted with a profusion of airy white flowers in late spring to midsummer. Reaching 6–10 ft. tall and 3–6 ft. wide, it commands attention in large borders or open woodland settings.

Growing Considerations

• Soil: Fertile, well-drained soil in full sun; tolerates poorer soil in part shade.
• Caution: Susceptible to rot in overly moist soils; may be short-lived.
• Hardiness: Best in zones 6 and warmer; survives colder winters with protection.

Propagation & Problems

Sow seed in a cold frame in spring or fall. Watch for clubroot, black rot, slugs, and snails.

At a Glance