Bigleaf Hydrangea
Hydrangea macrophylla
shrubA deciduous shrub known for its large, showy mophead or lacecap flower clusters that bloom in summer, with colors ranging from pink to blue depending on soil pH. It reaches 3–6 feet tall and is one of the most popular ornamental hydrangeas. The large foliage provides a lush backdrop to the impressive blooms.
Common Problems
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Care Guide
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Light
Partial shade is best; morning sun and afternoon shade prevent wilting and fading of flowers. Avoid intense afternoon sun in hot climates.
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Water
Water deeply and consistently during the growing season; keep soil evenly moist but not soggy. Reduce watering in winter.
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Soil
Prefers rich, well-draining, slightly acidic soil (pH 5.0–6.5); acidic soil produces blue flowers, neutral to alkaline produces pink.
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Fertiliser
Apply balanced fertilizer in spring; use aluminum sulfate to increase acidity and promote blue flowers, or lime for pink flowers.
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Temperature
Prefers moderate temperatures; protect from harsh winter winds and late spring frosts that may damage new growth.
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Humidity
Thrives in humid conditions; benefits from misting in dry climates and benefits from good air circulation.
Toxicity
dangerousToxic to CatsdangerousToxic to DogsdangerousToxic to Children
Contains cyanogenic glycosides that can cause gastrointestinal upset; all parts are toxic. Keep away from pets and children.
Common Diseases
Common Pests
Seasonal Care
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Resume regular watering and feeding as growth picks up.
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Peak growing season. Water and feed regularly.
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Reduce watering as growth slows. Stop heavy feeding.
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Minimal watering and feeding. Protect from frost if needed.