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Genus

Hydrangea

Hydrangeas are popular flowering plants valued for their large blooms, versatility, and ease of cultivation. They add elegance to any garden and thrive in various climates with proper care.

Habit: Hydrangeas are typically deciduous shrubs, though some species include small trees or climbing vines. Depending on the type, they exhibit rounded, mounding, or upright growth habits. For example, Bigleaf hydrangeas (Hydrangea macrophylla) have compact, bushy forms, while Panicle hydrangeas (Hydrangea paniculata) grow taller, with cone-shaped flowers. Others, such as Climbing hydrangeas (Hydrangea anomala), attach to walls or trellises.

Hardiness: Hydrangeas thrive in USDA Hardiness Zones 3-9, though specific hardiness varies by species. Panicle hydrangeas are among the most cold-tolerant, thriving in Zone 3, while Bigleaf hydrangeas perform better in milder climates, preferring Zones 5-9. Smooth hydrangeas (Hydrangea arborescens) also handle cold climates well and are known for their resilience.

Flowers: Hydrangeas bloom from late spring to early fall, depending on the variety. Their flower heads vary in form—mophead, lacecap, or conical clusters—and come in colors like white, pink, blue, and purple. Flower color in Bigleaf hydrangeas can change with soil pH, with acidic soil producing blue flowers and alkaline soil resulting in pink blooms​.

Uses: Hydrangeas are widely used for landscaping, including garden borders with companion plants, hedges, and container plantings. Their vibrant flowers are also popular in wedding bouquets, floral arrangements, and as dried flowers for decorative use.

Benefits: Hydrangeas provide aesthetic appeal year-round, offering lush blooms in summer and colorful foliage in fall, especially in Oakleaf hydrangeas. Their low-maintenance nature and adaptability make them an excellent choice for both novice and experienced gardeners, enhancing any outdoor space with seasonal interest.

All parts of the plant are considered poisonous if ingested due to cyanogenic glycoside. It’s generally safe for humans to handle, but ingestion can cause discomfort. Hydrangea is considered toxic to pets, including dogs and cats.

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