A vigorous (some would say invasive) rhizomatous perennial from China and Japan, otherwise known as Gooseneck Loosestrife. Graceful white-flowering racemes almost 20cm long have a gracefully crooked neck which bends the inflorescence down before it twists up again. Flowers mid to late summer. Comes from wet ravines and damp woodland margins as well as in lush grassland, easy to grow in cultivation on most rich soils. Hardy. 90cm. H6.