Hydrangea macrophylla ‘PIIHM-II’
This hydrangea variety has been bred to bloom all summer, tolerates heat quite well, and is disease resistant, most notably to powdery mildew. They produce large 3.5-5 in. diameter, mophead-style flower heads with attractive reddish-purple branches and dark-green leaves. This fast-growing plant can be planted in spring or fall.
Type: USDA zone 4-9
Light: Partial Shade
Water: Water weekly, or more often in extreme heat or containers.
Size: Moderate growth; reaches up to 3′-4′ tall and 4′-5′ wide.