This is a semi-evergreen, clump-forming perennial that is native to Southern United States and Mexico. It bears large, ovate, greyish green leaves glazed with white powder. In Summer, it features beautiful, panicles of violet-purple flowers on long, wiry stems. For best flowering grow in full sun, for largest leaves and tallest stems grow in partial shade. Keep in a sheltered position. Requires acid to alkaline, pond/in water, loam soil. Just as happy in a bog garden as it is in a pond. Pretty much fully hardy in most of the UK but during cold winters it will lose it's foliage. 
Ultimate height: 1.5-2.5 metres
Ultimate spread: 0.5-1 metres

Sent as a young plant in a 9cm pot. Sent as dormant plants in winter. May be cut back for shipping.

Photo by Lip Kee and By Ping an Chang - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79567582