Gardeners across the UK are being urged to move vulnerable potted plants into sheltered shade before Friday, as forecasters predict another spell of intense heat. After a recent heatwave, temperatures are expected to climb above 30°C in some regions, with highs in the upper 20s on Friday and even hotter conditions over the weekend. Some forecasts suggest temperatures could reach 33°C early next week.
Which Plants Are Most at Risk?
Popular flowers and shrubs such as petunias, hydrangeas, ferns, hostas, fuchsias, and other bedding plants are particularly susceptible to extreme heat, especially when growing in pots or hanging baskets. According to gardening advice from the Royal Horticultural Society (RHS) and the National Trust, these plants can quickly struggle once temperatures rise. While many cope well with warm summer weather, prolonged temperatures above 30°C pose a significant threat.
Why Potted Plants Are More Vulnerable
One of the biggest issues is that pots heat up much faster than the ground. As the compost becomes hotter, plant roots can struggle to absorb enough water, even when the soil still feels damp. This means leaves and flowers can dry out faster than the plant can replace lost moisture. Hydrangeas and ferns are especially vulnerable because they naturally thrive in damp conditions. Their large leaves lose water rapidly during very hot weather, which can lead to scorching, wilting, or browning in just a few hours of strong sunshine.
Practical Steps to Protect Plants
Experts recommend moving vulnerable plants to a spot that stays shaded during the hottest part of the day, or bringing smaller pots indoors temporarily. This helps keep both leaves and roots cooler until temperatures drop. Additionally, keeping plants well watered is crucial, but it's best to water early in the morning or later in the evening rather than during the hottest part of the day, when much of the moisture can quickly evaporate.
Petunias, although they enjoy sunny weather, can also suffer when temperatures become extreme. Containers and hanging baskets can quickly overheat during a heatwave, putting roots under stress and increasing the risk of permanent damage. By taking these simple steps before Friday, gardeners can help their plants survive the upcoming hot spell.
