Grow Hydrangea macrophylla 'Nantucket Blue' for rich, blue-purple mophead blooms and a classic, leafy shrub shape. You will get the strongest color in more acidic soil, while flowers can shift toward pink as soil becomes less acidic. This bigleaf hydrangea typically reaches 48-72 inches tall and can fill out to a similar width with a naturally rounded, multi-stemmed habit.

Site it in part shade to shade, ideally with morning sun and protection from hot afternoon sun. Keep soil evenly moist, especially during summer heat, and mulch to help hold moisture and keep roots cool. In warmer climates or in consistently moist soil, it can tolerate more sun, but dryness will reduce bloom quality and stress the foliage.

Plant in rich, well-drained soil amended with compost. Water deeply during establishment and continue regular watering during dry spells. For best flowering, avoid heavy pruning. If shaping is needed, prune right after flowering so you do not remove next season's buds that form on older stems. In late winter or early spring, remove only dead, weak, or winter-damaged wood.

In colder parts of its range, protect stems and buds from harsh winter winds and sudden temperature swings. A sheltered spot and a good mulch layer help. Use it as an accent shrub, in mixed borders, or in woodland-edge plantings where you can appreciate the large flower heads for cutting and drying.

Specifications

• Cold hardiness zone: 6-9 (-10 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Part sun   Shade
• Growth rate: Fast
• Mature height: 48-72"
• Spread: 48-72"

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