), is a species of flowering plant in the family Brassicaceae, native to the Caucasus.

It has gained the Royal Horticultural Society's Award of Garden Merit.

[2] The Latin specific epithet cordifolia, meaning "heart-shaped", refers to the leaves.

[3] Growing to 2.5 m (8 ft) tall by 1.5 m (5 ft) broad, it is a substantial clump-forming herbaceous perennial with kidney-shaped dark green leaves, 35 cm (14 in) or more in length, which die down in mid- to late summer.

[4] It is cultivated in gardens for its broad crinkled foliage and spectacular multi-branched inflorescences of many small fragrant white, cruciform (cross-shaped) flowers, reaching up to 2 metres (6 ft 7 in) high and appearing in early summer.