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Cloud of tiny white flowers of Greater Sea Kale above dark green foliagePerennials

Crambe cordifolia

Greater Sea Kale

sea kalewhite flower cloudborder perennialdrought-tolerantarchitectural

Greater Sea Kale is a spectacular perennial that produces a cloud of thousands of tiny white flowers on widely branching stems in June and July. The bloom resembles a giant white Gypsophila and is truly breathtaking. The large, rounded, dark green leaves form a substantial rosette at the base. An unmatched presence in the summer border.

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Before
After

Characteristics

Sun
Full sun
Water
Low
Height
100–200 cm
Spread
80–150 cm
Hardiness zone
6–9
Family
Brassicaceae
Evergreen
No
Flower colors
white
Wildlife value
bees, butterflies

Bloom period

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Care guide

Plant in full sun in well-drained, preferably chalky soil. Sea Kale has a deep taproot and tolerates drought well. Avoid heavy, wet soils. Give the plant ample space — it can grow quite large. Transplanting is difficult due to the deep root.

Pruning tips

Cut flower stems after blooming — they become messy once flowers fade. The foliage remains attractive into autumn. The plant does not need dividing and lives long in the same spot.

Good companions

Blooming lavender with purple-blue flowers in summer sunlightShrubs

Lavandula angustifolia

English Lavender

Lavender is a beloved herb with aromatic silver-green foliage and purple-blue flower spikes. This evergreen plant blooms profusely from June to August and is remarkably drought-tolerant, attracting butterflies and bees to the garden.

Full sunLow30–60 cm
Purple-blue flower spikes of woodland sage in a sunny borderPerennials

Salvia nemorosa

Woodland Sage

Woodland Sage is a compact perennial with striking purple-blue flower spikes blooming from June to August. It attracts plenty of bees and butterflies and works well in sunny borders. Cutting back spent flower stems often triggers a second flush of blooms.

Full sunLow30–60 cm
Pink-red Gallica Rose in full bloomShrubs

Rosa gallica

Gallica Rose

The Gallica Rose is one of the oldest cultivated rose species, grown since the Middle Ages. Its semi-double, vivid red-pink flowers appear in June and July and carry an intense fragrance. Decorative rose hips develop after flowering.

Full sunMedium90–120 cm