As the UK experiences repeated heatwaves, the hot and dry weather is damaging gardens and plants. More than two-thirds of England and all of Wales are now in drought, leading to hosepipe bans, or Temporary Use Bans, by nine water companies across England and Wales.
With soaring temperatures continuing, UK gardeners are urged to take protective action to safeguard their plants and gardens. Understanding how to water plants and lawns correctly is crucial, as there is an incorrect way to do it.
The worst time to water
Watering a thirsty lawn or parched plants during the peak heat of the day may seem sensible, but it is not. The RHS explains: "Timing makes a big difference to how effectively plants use water." The guidance is clear: "Avoid watering in the heat of the day – much of the water evaporates before reaching the roots."
Watering in full sunshine during the hottest part of the day means most water evaporates before reaching the roots. Plants then do not receive the required moisture, making it less beneficial.
The best time to water
The best time to water garden plants and lawns is early in the morning, while it is still cool. RHS advice states: "Watering early in the morning is the best time. There will be less evaporation, and plants can use the water through the day."
Evening watering is acceptable, but the RHS warns: "Evening watering is acceptable, but damp leaves overnight can encourage pests and fungal diseases." Stuart Thompson, senior lecturer in plant biochemistry at the University of Westminster, told Gardens Illustrated that plants can go through their own weight in water on a hot, sunny day. He adds that plants not in pots or planters benefit most from morning or evening watering, as water droplets have time to soak into the soil and reach the roots.
Tips for drought-tolerant plants
The RHS suggests making plants 'drought athletes': "Deep, occasional watering encourages deep roots and drought-tolerant plants. Train your plants to be 'drought athletes.'"
Matt J Adams, founder and lead gardener at The Relentless Gardener, advises: "Water smarter, not harder. A thorough soak every few days is much more beneficial than a light sprinkle every evening. Deep watering encourages the roots to grow further into the soil, making the lawn better equipped to cope with the next dry spell. Water early in the morning or later in the evening to minimise evaporation and avoid scorching the grass."
