A perennial herb growing to 0.8m (2' 7") preferring a well drained soil and a semi-shade to full sun position.
Flowers July-August and is renowned for attracting wildlife – particularly butterflies. Fragrant flowers suitable to be used as cut flowers.
An edible plant (although may be toxic if used in large quantities) – its unopened flower buds and young seed pods (3-4cm long) can be eaten cooked and are reported to have a pea-like flavour. Young shoots can be cooked as an asparagus substitute.
Long history of medicinal usage, mainly for lung conditions. A poultice of the dried powdered roots is used in the treatment of swellings, bruises and wounds.