Family:  Maranthaceae
Origin:  Native to Texas
Light:  Sun-part shade
Height:  4'-6'
Spread:  6-8'
Blooms:  Tall pendant stems of long-lasting pea-like clusters of purple flowers, late Spring
Foliage: 20"Lx10"W, blue-green with purple margin, lance-shaped, covered with white powder
Water:  Very high moisture needs
Seeds:  Purple berries
Propagation:  Tuber divisions
Uses:  For ponds, bogs, wet area, cut flowers
Comments:  Thalia dealbata or Powdery Thalia is a tropical bog perennial. It makes a nice accent plant when grown container submerged in 1' water above pot. Protect Powdery Thalia plants from strong wind.  It is a ummingbird attractor.  I grow mine in my pond.  Powdery Thalia can be overwintered indoors as houseplant.   
USDA Hardiness Zones :  6-10