A gardener has revealed the best and worst times to water your plants. Louise Harrow, who has more than 20 years of experience designing and maintaining residential and RHS-standard gardens, says the timing of your watering routine is just as important as how much water you use.

“The optimal time is between 6am and 9am—when temperatures are still cool, the sun is low, and plants are just starting to ‘wake up’ for the day,” Louise explained on behalf of My Home Improvements. An early morning watering is ideal for a number of reasons. Lower temperatures mean more water will soak into the soil and reach the roots rather than evaporating.

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It also helps promote healthier roots, as cool water in the morning gives roots moisture before the heat arrives, allowing them to stay hydrated throughout the day.

“Watering in the morning means leaves dry out faster, reducing the risk of mildew, root rot, and fungal infections,” Louise explained, adding that morning waterings are especially important for vegetabes, roses and potted plants more vulnerable to heat stress.