Hydrangea — 22 species

Hydrangea is a genus of deciduous and evergreen flowering shrubs loved for their large, mophead or panicle blooms. Most cultivars, including Endless Summer and Incrediball, thrive in morning sun with afternoon shade, though panicle types such as Vanilla Strawberry tolerate full sun. They prefer consistently moist, well-drained, organically rich soil and benefit from deep watering once a week, more frequently in heat. All Hydrangea species are toxic to cats and dogs; cyanogenic glycosides in the leaves, buds, and flowers can cause vomiting, depression, and diarrhea.