Hydrangeas can thrive during summer if gardeners follow a simple mulching trick, according to experts at Gardening Know How. Leaving soil bare around hydrangeas is a critical error because dark, exposed soil acts as a heat sink, absorbing solar radiation, baking root systems, and accelerating water evaporation.
Mulching Is Essential
To protect hydrangeas, mulch generously around each shrub to a depth of two to three inches. During peak summer, wood chips or straw are ideal for retaining moisture. These materials are available at garden centres or budget-friendly shops like B&M and Home Bargains. Heap mulch around the base but leave a few inches of clear space around stems to prevent pest infestations and wood rot.
Watering Best Practices
Inconsistent moisture is one of the biggest harms to hydrangeas in summer. Gardening experts advise giving plants a thorough soaking once or twice a week rather than light, daily sprinkles. Watering early in the morning ensures hydration before the day's heat and allows any accidental water on leaves to dry by nightfall, preventing disease.
Planning Ahead for Resilience
Getting hydrangeas off to the right start makes them more resilient to heatwaves. They thrive in fairly moist, well-draining soil. If soil is naturally light, bulk it up with moisture-retaining organic matter like compost or well-rotted manure before planting. Thoroughly water the hydrangea in its pot about an hour before planting, and do not plant it deeper than it was in its original container. Water it in deeply after planting. Directly after planting, cover the area with a layer of leaf mould, well-rotted manure, or compost. For climbing varieties, initially train them onto galvanised wires; after one season, their self-clinging aerial roots will take over.
Signs of Stress
Under blazing sun, transpiration (rapid water evaporation through leaves) speeds up, stressing the plant. Curling, browning, or crispy leaves signal that intervention is needed. Short-term damage can spoil future growth and result in fewer flowers next year, depending on the plant variety.
