Greater sea-kale, colewort

Think about...

Food bonus, not main crop

Unlike sea kale, this species is mainly grown for its ornamental value, with limited but usable edible parts.

Let it build strength

Heavy harvesting can weaken the plant, especially in early years.

Disturb as little as possible

The deep root system means harvesting roots is rarely practical without killing the plant.

Give it room

This is a large perennial that benefits from generous spacing.

Overview

Size (cm): 150 cm width · 180 cm height
Zone: USDA 4-8

Dive deeper

General

Greater sea-kale is a large perennial grown mainly for its foliage and airy white flowers, but it also has some edible uses, particularly in spring.

Light

Full sun to light shade.

Soil type

Deep, fertile, well-drained soil.

Water requirement

Moderate; prefers consistent moisture.

Nutrient requirement

Low to moderate; grows best in reasonably fertile soil.

Precultivation

Seed can be slow and uneven. Young plants transplant better than older ones.

Planting

Plant in a permanent location with good soil depth and drainage.

Pruning

Minimal pruning required; remove old stems after the season.

Maintenance

Avoid prolonged drought and disturbance once established.

Harvest

Young shoots can be harvested in spring and used similarly to other Brassica shoots. Young leaves can also be cooked. Avoid harvesting too heavily, as the plant relies on its foliage to build strength.

Common issues

Poor growth in dry soil and stress from disturbance.

Pollination

Insect-pollinated.

Companion plants

Tall grasses, salvia, echinacea and other large perennials.

Incompatible plants

Very drought-adapted plants and shallow dry soils.

Back to plant list