Meadow Blazing Star. One of the many garden stars at Denver Botanic Garden's Chatfield gardens, this is especially favored by Monarch butterflies. Fluffy rose-purple flowers to an an inch or more wide appear on the vertical 12"-36" stems midsummer to September. Native from Alberta to New Mexico, this likes sandy or rocky soils on the dry side. Rich loamy easy-livin' soils pushes too much growth leading to the dreaded flop.