Pink flowers come in both warm and cool color tones and can be ... dahlias are truly remarkable in their diversity. These tender perennials are winter hardy only to USDA Hardiness Zone 7. Elsewhere, ...

Yarrow is a hardy perennial that produces clusters of small, flat-topped flowers in shades of yellow, white, pink, and red.

Short lived perennial adapted to southern Canada, northern US states, and higher elevations in the western US. Prefers cool and moist habitats. It tolerates acid, alkaline, low fertility and poorly ...