Caring for Panicle Hydrangea

Water panicle hydrangeas regularly during the growing season, especially in prolonged dry spells. They have moderate water needs and prefer consistently moist soil, though established plants tolerate short dry periods better than mophead hydrangeas. In summer, water deeply once or twice a week rather than little and often, encouraging deep root growth. Reduce watering from late autumn as growth slows. Mulch annually in spring with a 5 cm layer of garden compost or bark to retain moisture and suppress weeds. Feed in March or April as new growth begins, using a balanced general-purpose fertiliser (such as blood, fish and bone) or a slow-release shrub feed. A second, lighter application in late April supports the developing flower buds. Avoid high-nitrogen feeds after May, as these promote soft leafy growth at the expense of flowers and reduce winter hardiness. Panicle hydrangeas are generally trouble-free but can suffer from powdery mildew in dry conditions or congested growth—ensure good spacing and air circulation, and water at the base rather than overhead. Aphids occasionally cluster on new shoots in spring; a strong jet of water or insecticidal soap usually resolves this. Capsid bugs can cause distorted leaves and shot-hole damage; they're hard to control but rarely serious. No winter protection is needed in zones 7–9. The shrub is fully hardy and loses its leaves in autumn. Tidy fallen foliage to reduce overwintering fungal spores. In exposed sites, a loose mulch around the root zone offers extra insulation, though it's rarely necessary for this tough, reliable shrub.