Milkshake Coneflower Seeds Beautiful Summer Blooms Fresh Full double white pom pon flowers on strong stems. Very similar to Pink Double Delight but white.. Hummingbirds keep on coming to this one! Zones: 4-9 Like all doubles, the flower starts blooming at the bottom, exposing the nice yellow center, and the bloom progresses until it is a full double. Mature Height: 36 inches Mature Width: 30 inches Bloom Size: 3" Form: Upright Growth Rate: Fast Seed starting instructions included.