Crambe Maritima St Ninian's Cave is a Crambe that bears dense racemes of tiny white or yellow flowers held above a rosette of basal leaves. Flowering occurs from June to August. The inflorescences are borne on mostly leafless stems so the flower spikes read clearly above surrounding foliage.

Crambe Maritima St Ninian's Cave produces dense racemes of white or yellow flowers from June to August.

Crambe Maritima St Ninian's Cave

Crambe cordifolia is a perennial herbaceous plant that reaches about 2.0 m and is cultivated for its tall summer flowerheads. It flowers from June to August and the blooms are scented. It prefers a sunny position in soils from sandy to clay, provided they are well-drained or moist but well-drained. Use it as a specimen or at the back of a border where its height can be shown off.

Greater sea kale Crambe cordifolia produces tall, fragrant flowerheads in June to August and suits full sun in well-drained sandy to clay soils.

https://en.wikipedia.org/wiki/Crambe_cordifolia

Crambe is a genus of annual and perennial flowering plants in the family Brassicaceae, native to a variety of habitats in Europe, Turkey, southwest and central Asia and eastern Africa. They carry dense racemes of tiny white or yellow flowers on stems above the basal leaves.

Crambe cordifolia

Greater sea kale | Crambe cordifolia

Crambe orientalis is a perennial in the Brassicaceae that sends stems to about 1.2 m, each topped with dense racemes of small white or yellow flowers. It flowers from June to August. The plant prefers full sun and a moist but well-drained soil and will tolerate sandy, loamy or clay textures. Rated H6, it is very hardy in UK gardens.

Crambe orientalis produces upright 1.2 m stems with white or yellow racemes from June to August and prefers full sun and moist, well-drained soil.

Crambe orientalis

Crambe pontica is a member of the Brassicaceae family within the genus Crambe, notable for bearing erect stems topped with dense racemes of small flowers. In the UK it blooms from June to August. The flowers sit above a basal rosette of leaves, presenting the inflorescences clearly to pollinators and to the eye. Identification relies on the compact raceme structure typical of Crambe species.

Crambe pontica is a Brassicaceae species that produces dense racemes of flowers in the UK from June to August.