Other advantages include drought tolerance, poor soil adaptability, and durability. They perform best in full sun or light shade. Both have double flowers and grow to about 2 feet in height. The 2 foot plant bears numerous soft yellow flowers from late June through October. These make excellent selections for use as edging or rock garden plants.
Coreopsis are pest resistant.
Leaf spots may be a problem especially in wet years, but they usually don't affect the first bloom. Cut plants back severely after flowering and the new growth will be strong and healthy. The only disadvantage of coreopsis is the necessity of deadheading. Trim spent flowers off regularly to promote continuous production of new flowers. If not deadheaded, only naked flower stalks will remain above the foliage.