36-40" tall x 18" wide (seed propagated). You'll be a happy gardener when this stunning, large-flowered Coneflower comes into bloom. A sturdy, vigorous cultivar with large flowers, the pure white petals are held horizontally from the center cone. Mature plants covered in bloom from mid-summer through early fall. 'Happy Star' is the result of many years of breeding by the perennial experts at Jelitto Seed of Germany. Compost enriched garden loam. Plant with Liatris and Little Bluestem Grass.