About Smooth Hydrangea

Smooth hydrangea (Hydrangea arborescens) is a tough, native shrub producing massive white flower heads from June through September. Extremely cold-hardy to Zone 3, it thrives in part shade and is one of the easiest hydrangeas to grow. Note: all parts of hydrangea are toxic to dogs, cats, horses, and rabbits — not recommended for pet-accessible gardens.

Growing Zones

Smooth Hydrangea (Hydrangea arborescens) grows in USDA Hardiness Zones 3–9. It thrives in part sun and reaches 3–5 feet tall.

Is Smooth Hydrangea Safe for Dogs?

Smooth Hydrangea may be toxic to dogs. Consult your veterinarian if ingestion is suspected. ASPCA Animal Poison Control: (888) 426-4435.

Is Smooth Hydrangea Safe for Cats?

Smooth Hydrangea may be toxic to cats. Consult your veterinarian if ingestion is suspected. ASPCA Animal Poison Control: (888) 426-4435.

Is Smooth Hydrangea Deer Resistant?

Smooth Hydrangea is not rated as highly deer resistant and may be browsed by deer, especially when young or in areas with high deer pressure.

Does Smooth Hydrangea Attract Pollinators?

Smooth Hydrangea attracts bees and pollinators and butterflies, making it an excellent choice for pollinator gardens.

How to Care for Smooth Hydrangea

Smooth Hydrangea grows best in part sun with medium water needs. Plant in USDA Hardiness Zones 3–9 for best results. Prune after flowering to maintain shape and encourage repeat blooms.