Oakleaf hydrangea
Hydrangea quercifolia · Hydrangeaceae
📷 Eric in SF · CC BY-SA 3.0
⚠️ Feuilles, fleurs et bourgeons contiennent des glycosides cyanogènes ; leur ingestion peut provoquer vomissements, diarrhée ou abattement chez chiens et chats.
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around oakleaf hydrangea and prepare for winter.
ID card
- Common name
- Oak-leaf Hydrangea
- Family
- Hydrangeaceae
- Type
- Deciduous shrub
- Mature height
- Approximately 150 cm
- Flowering
- June to August
- Foliage
- Deciduous, deeply lobed resembling oak leaves
- Hardiness
- Good, down to -15 °C
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
Protect it from dry wind in the first year and ensure thick mulch. Bright flowers appear on last year's wood: avoid pruning before June.
The common mistake
Pruning in autumn or winter damages future white flowers: many gardeners do this and wonder why their plant won't bloom.
The pro's trick
Leave dried flowers all winter for fall ornament, then prune lightly in March: it's practical and really stunning.
Care
Sunlight
Plant this hydrangea in partial shade or dappled light for optimal flowering. While it tolerates morning sun, it appreciates protection from afternoon rays, especially in warm regions. Too much shade will reduce flowering.
Watering
Keep the soil regularly moist, particularly during growth and flowering periods. Water deeply once or twice a week depending on weather conditions and soil type. Avoid complete drying out, but also prevent waterlogging which can promote disease.
Soil and compost
Prefer rich, well-draining soil that is slightly acidic to neutral. Adding organic matter (compost, peat) improves structure and moisture retention. A 5 to 10 cm mulch layer at the base helps maintain soil coolness and regulates temperature.
Pruning
Prune lightly after flowering (late August-September) to maintain a compact shape and remove faded flowers. Remove dead or damaged branches in late winter. This shrub flowers on the previous year's wood, so avoid severe winter pruning.
Fertilizing
Apply balanced fertilizer (or special flowering shrub formula) in spring when growth starts. A second light application in early summer can encourage flowering. Reduce feeding in autumn to avoid stimulating tender growth before winter.
Diseases and pests
Watch for powdery mildew and leaf spots in excessively humid conditions; improve air circulation through airy pruning. Scale insects and aphids may appear: treat with soapy water or neem if necessary. Poor drainage promotes root rot.
Did you know?
The oak-leaf hydrangea originates from the southeastern United States and owes its name to its magnificent deeply lobed leaves that truly resemble those of oak trees. Its spectacular white panicle-shaped flower clusters inspired botanists to first cultivate it in collection gardens before it became popular in Europe during the 20th century.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- HydrangeaHydrangea macrophylla
- Mock orangePhiladelphus coronarius
- Smooth hydrangeaHydrangea arborescens
- Panicle hydrangeaHydrangea paniculata
- Mountain hydrangea, tea of heavenHydrangea serrata
- Fuzzy deutziaDeutzia scabra
Tips generated and checked by Viridia — adapt them to your local climate.