Incrediball is an improved cultivar of the Annabelle Hydrangea. Bright white flowerheads are larger than on the Annabelle, and the stems are sturdy enough to hold the flowers so they will not get weighted down by rain. Medium-green leaves turn yellow in the fall. Incrediball needs adequate moisture in full sun. It is not drought tolerant. It grows best in an area with morning sun and afternoon shade. A great shrub that makes a standout in the landscape.