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Smooth Hydrangea

Hydrangea arborescens

shrub

A deciduous shrub native to eastern North America, producing large, white flower heads from summer through fall that gradually age to pink or bronze. It reaches 3–10 feet tall and is one of the most cold-hardy hydrangeas. The species blooms on new wood, making it forgiving for gardeners who prune hard each spring.

Smooth Hydrangea

Common Problems

Select the problem your Smooth Hydrangea is experiencing to get a treatment guide.

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Yellow Leaveschevron_right
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Wiltingchevron_right
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Slow Growthchevron_right
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Underwateringchevron_right
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Brown Tipschevron_right

Care Guide

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Light
Full sun to partial shade; performs well with 4–6 hours of direct sun, tolerating more shade than other hydrangeas.
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Water
Water regularly to keep soil consistently moist; establish deep roots during the first season with regular watering.
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Soil
Adapts to various soil types; prefers fertile, moist, well-draining soil with pH 5.0–7.0.
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Fertiliser
Apply balanced fertilizer in spring; mulch annually with compost to maintain soil fertility and moisture.
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Temperature
Extremely cold-hardy; thrives in cool to moderate climates and tolerates temperature extremes well.
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Humidity
Tolerates moderate humidity levels; performs best with consistent soil moisture rather than high atmospheric humidity.

Toxicity

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Contains cyanogenic glycosides that can cause gastrointestinal upset; all parts are toxic. Keep away from pets and children.

Common Diseases

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Common Pests

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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.

Smooth Hydrangea Care Guide — Hydrangea arborescens | GreenScout