As UK temperatures are forecast to reach up to 40°C this week, gardening expert Kate Rushworth has highlighted critical watering times to avoid heat stress in plants. She warns that watering at the wrong time is "one of the biggest mistakes" gardeners make during a heatwave.
Optimal Watering Windows
Rushworth advises that plants should be watered deeply at the base either first thing in the morning, ideally before 9am, or last thing at night, after 8pm. This ensures water reaches the roots instead of evaporating in the midday sun. "A light sprinkle on the leaves won't do; they need a proper drink to survive the heat," she said.
Risks of Improper Watering
Water evaporation due to high temperatures can cause wilting, sunburned leaves, and stalled growth. Persistent hot weather may also disrupt flowering, reduce fruit yields, and make plants more susceptible to drought and disease.
Additional Protective Measures
Rushworth emphasises that applying mulch is "non-negotiable" during hot weather. A generous layer of composted bark locks in moisture and keeps the soil cool. Containers and hanging baskets dry out faster than ground plants and should be moved to shadier spots for extra protection.
Maintaining a consistent plant care routine now will help gardens stay healthy and thriving through the dry, hot days.
