Hydrangea
Hydrangeas are stunning flowering shrubs with large, showy blooms that change color based on soil pH. These versatile green plants add dramatic beauty to gardens and can be dried for long-lasting floral arrangements.
Hydrangea Care Guide
Environment
Hydrangeas prefer morning sun with afternoon shade, especially in warmer climates. They thrive in rich, moist soil with good drainage and protection from harsh winds.
Light
Most varieties prefer partial shade, especially in hot climates. Too much shade reduces flowering, while too much sun can cause wilting and leaf scorch.
Temperature
Hardy in USDA zones 3-9, depending on variety. Protect from late spring frosts which can damage new growth and developing flower buds.
Watering
Keep soil consistently moist but not soggy. Water deeply at the base, about 1 inch per week, more during hot periods. Mulch to retain moisture and reduce watering needs.
Humidity
Prefers moderate humidity. In dry climates, regular watering and mulching help maintain adequate moisture levels.
Fertilizing
Apply a balanced, slow-release fertilizer formulated for acid-loving plants in early spring and again in early summer. Avoid fertilizing after August as this can affect winter hardiness.
Care Tips
- Soil pH affects bloom color in many hydrangea varieties: acidic soil (pH 5.5 or lower) produces blue flowers, alkaline soil (pH 6.5 or higher) produces pink flowers.
- Prune according to variety: bigleaf and oakleaf hydrangeas bloom on old wood and should be pruned after flowering; panicle and smooth hydrangeas bloom on new wood and should be pruned in late winter.
- Apply a 2-3 inch layer of mulch to conserve moisture and protect roots.
- Provide winter protection in colder regions by wrapping plants with burlap or adding extra mulch.
Common Problems
- Wilting leaves may indicate underwatering, overwatering, or too much sun.
- Lack of flowers can be caused by improper pruning, insufficient light, or late frosts.
- Powdery mildew appears as a white coating on leaves in conditions with poor air circulation.
- Leaf spots and rust are common fungal issues in wet conditions with poor air circulation.
Seasonal Care
Spring
Apply fertilizer and mulch. Protect new growth from late frosts.
Summer
Water deeply during dry periods. Deadhead spent blooms to encourage new flowers in reblooming varieties.
Fall
Reduce watering as temperatures cool. Leave spent blooms on the plant for winter interest and protection.
Winter
Minimal watering needed. Protect plants in colder regions with burlap wraps or extra mulch.