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Hydrangea care depends first on which hydrangea you have. Bigleaf, oakleaf, panicle, and smooth hydrangeas differ in sun tolerance and in whether they flower on old or new wood, so identify the plant before pruning. The guidance below draws mainly on University of Georgia Extension publications; adjust timing and site care for your local climate, soil, and cultivar.
How do you identify your hydrangea?
Start with the plant’s leaf shape, bloom form, and label if available. Common landscape types include bigleaf (Hydrangea macrophylla), oakleaf (H. quercifolia), panicle (H. paniculata), and smooth (H. arborescens). Their pruning windows are not interchangeable. Bigleaf alone has more than 500 known cultivars in the nursery trade, according to University of Georgia Cooperative Extension’s 2017 publication, so cultivar behavior can vary too.
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Look for cultivar information, especially whether a bigleaf hydrangea is a traditional old-wood bloomer or a reblooming type that flowers on both old and new wood. Local winter conditions and drainage also matter when choosing or caring for a plant. UGA Extension’s identification and pruning guide describes common types and their flowering habits.
When should you prune hydrangeas?
Prune according to the wood that carries the flowers. Old-wood types form flower buds before the next growing season; pruning at the wrong time can remove them. Use sharp, clean shears and make clean cuts. Remove dead or damaged branches as needed, but avoid cutting back more than necessary.
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- Bloomstruck Bigleaf Hydrangea is a colorful deciduous shrub that is prized for its vivid rose-pink, violet, blue-purple mophead blooms that appear from summer to fall. The color of the blooms are dependent on your soil PH level. Its colors pop against its dark green foliage.
- Bloomstruck grows in zones of 4-9 and prefers partial sun and moist, well-drained soil.
- Rounded to spreading habit, this beauty will reach 3-4 feet tall and 4-5 feet wide when matured.
- Botanical Name and or Other Common Names: Hydrangea Macrophylla ‘ PIIHM-II’ (PP# 25566), BloomStruck Reblooming Hydrangea, BloomStruck Bigleaf Hydrangea
| Hydrangea type | Flowering wood | Pruning window and approach |
|---|---|---|
| Bigleaf (H. macrophylla) | Traditional cultivars flower on old wood; some newer reblooming cultivars flower on old and new wood. | For traditional types, prune just after flowering. UGA’s 2017 circular advises avoiding pruning after August 1 because buds for the following season form in late summer. Check the cultivar’s guidance before applying that timing to a rebloomer. UGA Cooperative Extension, Circular 973. |
| Oakleaf (H. quercifolia) | Old wood | Prune lightly just after flowering; leave stems where possible. UGA Extension Forsyth County. |
| Panicle (H. paniculata) | New spring growth | Prune in late winter or early spring before growth begins. Lightly remove old flower heads and dead branches while preserving the plant’s natural form. UGA Extension Fulton County, 2025. |
| Smooth (H. arborescens) | New wood | Prune in late winter. UGA guidance says cutting back to 6–12 inches can stimulate vigorous regrowth for this type; that is not a general pruning height for all hydrangeas. UGA Extension Forsyth County. |
How much sun and water do hydrangeas need?
Match the light to the species
Bigleaf hydrangea generally does best with morning sun and afternoon shade. Avoid hot, dry, exposed sites. Panicle hydrangea tolerates more sun than the other types discussed in the UGA guidance; do not assume all hydrangeas need the same degree of shade.
Keep the root zone evenly moist, not soggy
Bigleaf hydrangea is water-demanding. UGA recommends watering when it begins to wilt if rainfall has not supplied enough moisture, and avoiding water stress while spring flowers are forming. Across hydrangeas, aim for evenly moist soil without waterlogging. Apply 2–4 inches of organic mulch to help conserve moisture and suppress weeds, keeping the material from piling against stems. These care recommendations are from UGA publications and should be adapted to local weather and soil drainage.
How do you plant a hydrangea?
- Choose a suitable site. For bigleaf hydrangea, favor morning sun, afternoon shade, and moist, well-drained soil rather than a hot, dry, exposed location.
- Set the plant at the right height. Place the root ball so its top is level with the surrounding soil surface.
- Water it in. Water thoroughly after transplanting to settle soil around the roots.
- Mulch the bed. Use organic mulch to conserve moisture and reduce weeds. If improving soil, base amendments on local soil conditions rather than applying a fixed recipe without a soil assessment.
Bigleaf hydrangeas can also be grown in containers, which may make it easier to protect them during cold nights. UGA’s planting guidance is in Circular 973.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you turn hydrangeas blue or pink?
The familiar blue-to-pink adjustment applies chiefly to color-responsive bigleaf hydrangeas—not to every hydrangea species or white-flowered cultivars. In bigleaf hydrangeas, aluminum availability affects flower color, and soil pH influences how available aluminum is. Acidic soil (UGA cites pH 5.5 or lower) generally makes aluminum more available and blue more likely; neutral or alkaline soil (pH 7.0 or higher in the circular) reduces availability and tends toward pink.
UGA discusses sulfur or aluminum sulfate treatments to encourage blue and lime to encourage pink, but those are not universal recipes. Test the soil first and follow local Extension recommendations for any amendment. Results can take time, and a drench that contacts leaves can damage foliage. See UGA Cooperative Extension’s bigleaf hydrangea guidance.
Why is my hydrangea not blooming?
For bigleaf hydrangea, check the flowering wood and the plant’s recent conditions before adding fertilizer or pruning again. UGA identifies several common causes:
- Winter bud injury: Cold may damage buds formed on old wood, even when the plant itself survives.
- Pruning at the wrong time: Late-summer, fall, or winter pruning can remove next season’s buds on traditional bigleaf cultivars.
- Too much shade: Insufficient light can reduce flowering.
- Excess nitrogen: High nitrogen can favor leafy growth at the expense of flowers.
When winter has killed or damaged growth, removing dead wood may help plant health even if the season’s bloom is reduced. If the plant is otherwise healthy, allow it time to form new growth rather than repeatedly cutting it back.
Should you fertilize hydrangeas?
Fertilize sparingly and follow the product label. A 2025 Fulton County Extension article recommends balanced, slow-release fertilizer and cautions that too much nitrogen may encourage foliage rather than flowers. UGA’s 2017 bigleaf circular gives a general-purpose fertilizer example and schedule for Georgia; do not treat that regional schedule as a universal prescription. Soil conditions and local recommendations should guide fertilizer choices.
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