Coreopsis Moonbeam One Gallon Plant Coreopsis Moonbeam will fill your yard with a profusion of creamy yellow flowers on a refined, airy form. Quite a statement in borders. The moonbeam coreopsis adds a delicate element with loads of blooms. Hardy to USDA zone 3 and all higher zones, so a plant that will succeed in most locations. Consider this easy care perennial in containers or hanging baskets. Herbaceous. Full sun, growing to about 1 feet tall by about 2 feet wide, though it is recommended to keep old blossoms cut back for a more steady supply of color. Once established, needs only occasional watering. Shipped in soil to ensure the best possible start when planted in yard or garden. 1992 Perennial of the Year.