With the UK bracing for a mini-heatwave ahead of the first May Bank Holiday, gardeners are seeking ways to keep plants from wilting. Met Office forecasts indicate another hot, dry summer, with global temperatures potentially reaching 1.5°C above pre-industrial levels for the fourth consecutive year.
Waine Delaney, from mushroom cultivation specialists Monotub, recommends soaking chopped edible mushrooms in a watering can for 24 hours, then using the water on plant roots after sunset. “Mushrooms are natural sponges, made up of 85–90% water,” he explains. “They act as a hydration pod, slowly releasing moisture into the soil and reducing evaporation during peak heat.”
The infusion also releases key nutrients like potassium, selenium, magnesium and phosphorus, creating a gentle tonic that restores minerals lost in hot weather. Additionally, the mushroom water encourages mycelium growth in the soil, improving moisture retention and absorption.
Even if heavy rain follows the heatwave, container plants may not get enough water due to the ‘canopy’ effect of leaves. Another tip comes from Simon of Walking Talking Gardeners, who suggests tapping terracotta pots: a ringing sound means the pot is dry, while a dull thud indicates it is watered.
