Height: 1′-2′ Spread: 3′-6′. The parent plant is located at the USDA Experimental Station in Cheyenne and is around fifty years old, standing about 2′ tall and 6′ wide. When in bloom, it is a striking cloud of white flowers. Bright green foliage gives it a lush look even out of bloom, making it one of the best white potentillas. Tough and long-lived. Full sun. Zone 2.