Rhododendron — 33 species

Rhododendron is a vast genus of woody shrubs and small trees, encompassing both rhododendrons and azaleas, renowned for spectacular spring flower clusters in shades from white to deep purple. They demand acidic, humus-rich, well-drained soil and perform best in dappled shade or morning sun with afternoon shelter. Compact varieties like Yakushima Rhododendron suit smaller gardens, while Catawba and Yellow Azalea suit larger borders. All Lonicera species are toxic to cats and dogs; grayanotoxins cause drooling, vomiting, and cardiac effects.