A cultivar of unidentified parentage, this cultivar was originated by Hajime Sugita of Japan and registered by Peter Ruh of Ohio in 1998. It is a giant size plant that grows to 29 inches in height with a spread of 64 inches. The leaves start the spring light blue-green before turning dark green later. The foliage is broadly oblong-ovate and cupped in an upward direction. It is also heavily corrugated and has thick substance. Starting from late June into July, 'Powder Blue' bears very pale, lavender flowers.

According to The Hostapedia by Mark Zilis (2009), "This cultivar holds true to its name with its intensely blue foliage color. Also great are its substance, corrugation, and large size mound size."