Sea kale

Think about...

Built for the coast

Sea kale thrives in sandy, well-drained soils and tolerates salt and wind, making it ideal for coastal gardens.

Roots go deep

Its deep taproot makes it hard to move once established. Choose the planting spot carefully from the start.

Cover for gourmet shoots

Blanching produces tender, mild shoots similar to asparagus. This is the traditional way to harvest sea kale.

Let it establish first

Avoid harvesting heavily during the first years. Strong plants will produce better harvests later.

Beautiful and useful

With its silvery leaves and white flowers, sea kale is both decorative and edible in the garden.

Drainage is everything

Poor drainage can cause root rot. Always plant in free-draining soil, especially in winter-wet climates.

Overview

Size (cm): 80 cm width · 60 cm height
Zone: SE 1-6 · USDA 4-8
Comfort temperature: 10-24 C
Temperature limit: -25 C
Planting temperature: 8 C
Germination time (days): 21

Dive deeper

General

Sea kale is a hardy perennial vegetable native to coastal areas. It forms a clump of blue-green leaves and produces fragrant white flowers. Traditionally grown for its blanched spring shoots, it is both ornamental and edible.

Light

Full sun.

Soil type

Light, sandy, well-drained soil; tolerates poor soils and coastal conditions.

Water requirement

Low; drought tolerant once established.

Nutrient requirement

Low to moderate; excessive fertility reduces quality.

Precultivation

Seeds benefit from soaking or scarification before sowing. Sow in pots or trays and keep at moderate temperatures. Germination can be uneven. Handle seedlings carefully due to the taproot.

Planting

Plant in a sunny location with very well-drained soil. Space plants about 50–80 cm apart. Avoid transplanting older plants. Suitable for raised beds or sandy soils.

Pruning

No pruning required. Remove old leaves after the season if needed.

Maintenance

Minimal care needed once established. Ensure excellent drainage and avoid overwatering. Mulch lightly with compost in spring.

Harvest

Harvest blanched shoots in spring when young and tender. Leaves can also be harvested early in the season. Stop harvesting once flowering begins to allow the plant to recover.

Common issues

Root rot in poorly drained soil is the main issue. Slugs may attack young shoots. Otherwise generally resilient.

Pollination

Insect-pollinated.

Companion plants

Lavender, thyme, rosemary, other drought-tolerant perennials.

Incompatible plants

Moisture-loving plants and heavy, poorly drained soils.

Back to plant list