How to Grow Hydrangea
Shrub
Hydrangeas are generous shrubs valued for broad leaves and long-lasting, showy heads of flowers. Mopheads and lacecaps bring summer colour to shady borders, while paniculata forms cope with more sun. Their reliable presence suits cottage gardens, modern plots and containers, provided their soil never dries out completely.
Planting
Plant container-grown hydrangeas in spring or early autumn, when rain and mild temperatures help roots settle. In northern gardens and Scotland, spring planting gives tender new growth more time before winter; in milder southern areas, autumn is often ideal. Choose moisture-retentive but well-drained soil in light shade, though paniculata hydrangeas tolerate more sun if watered. Dig a hole wider than the rootball, plant at its original depth, water deeply and mulch with leaf mould or garden compost.
Care
The name hydrangea hints at water, so keep plants evenly moist, especially in their first summers and when growing in pots. Mulch each spring and water at the base during dry periods. Pruning depends on type: lightly tidy mophead and lacecap hydrangeas after flowering, retaining healthy old stems, but cut paniculata hydrangeas back harder in spring. Protect exposed plants from late spring frosts.
Bloom time
Mophead and lacecap hydrangeas generally flower from July to September, often holding faded heads into autumn. Paniculata varieties commonly bloom from August to October. In mild southern gardens, displays may begin earlier or last longer; cooler northern sites can be a little later.
Garden uses
Hydrangeas brighten woodland-edge borders, north- or east-facing gardens and roomy patio pots. Pair them with ferns, hostas and hardy geraniums for a leafy, layered effect. Paniculata types make useful focal points in sunny mixed borders. Fresh or dried flowerheads suit indoor arrangements, and lacecap flowers offer accessible nectar for visiting insects.
Tips
On mophead and lacecap hydrangeas, flower colour is influenced by soil: acid soil tends towards blue, while alkaline soil tends towards pink. Avoid trying to force a colour if your soil naturally resists it. Leave faded heads over winter to protect buds and add texture, then remove them in spring just above healthy new growth.
Growing Hydrangea: frequently asked questions
How do I grow hydrangea in the UK?
Plant container-grown hydrangeas in spring or early autumn, when rain and mild temperatures help roots settle.
When does hydrangea flower?
Mophead and lacecap hydrangeas generally flower from July to September, often holding faded heads into autumn.
How do I care for hydrangea?
The name hydrangea hints at water, so keep plants evenly moist, especially in their first summers and when growing in pots.
General guidance for UK gardens. Timing and hardiness vary by region and season; the RHS or a local garden centre can advise for your area. Page updated 18 Sep 2026.