Goats Rue (Galega Officinallis or French Lilac)
We have this in the Wishing Well Garden in the Cardoon Border.
It looks very delicate, fluffy and romantic with pea like leaves and flowers in the palest lilac or white.
Its a true perennial and dies right down to be dormant through the Winter, but grows quickly and strongly from early Spring into a large bush around 3-4 feet (90-120cm).
We have found it to be tough and hardy, it does elf-seed, ideal for wild areas, full sun and large borders and poor soils.
Of course it is great for the pollinators too.