Hot Summer Coneflower Seeds Beautiful Summer Blooms Fresh This is a breathtaking plant. The flowers emerge yellow and then darken to red as they mature, leaving a beautiful kaleidoscope of color on one plant. Hummingbirds keep on coming to this one! Zones: 4-9 Mature Height: 36 inches Mature Width: 36 inches Bloom Size: 3" Form: Upright Growth Rate: Fast Light: Sun Flower Color: Yellow to Red Foliage Color: Green Seed starting instructions included.