As the UK navigates its third significant heatwave this year, not just people but also our natural environments are feeling the strain. Gardens and allotments across the country are facing challenges ranging from scorched plants to a decline in beneficial insects, alongside the prospect of higher water bills for those striving to keep their greenery hydrated. Fortunately, horticultural experts are sharing valuable strategies to help homeowners and gardeners maintain healthy, vibrant spaces while also managing costs.
One of the most impactful long-term solutions for heat mitigation in gardens is planting trees. Rachael Austin, a landscape designer who secured a gold award at this year's Royal Horticultural Society (RHS) Badminton Flower Show, highlights how trees act as natural parasols. Her award-winning 'Artisan Woodland Craft Garden' demonstrated how increased canopy cover, even in urban settings, can significantly reduce ground-level temperatures, potentially by as much as 10°C in a woodland environment. With the RHS noting that only 2.5% of the UK is covered by natural woodland, and built-up areas increasingly experiencing the 'urban heat island' effect, individual gardens can play a crucial role in cooling local environments.
Water conservation is another critical area, especially given the hosepipe bans experienced last summer. Marcus Bergin, a professional gardener with over 25 years of experience, strongly advises installing as many water butts as possible to capture rainwater. These containers, typically connected to guttering, store rain for later use, reducing reliance on mains water. Bergin also suggests exploring grey water systems, which divert used water from showers, baths, and sinks for garden irrigation, though he cautions against using kitchen sink water due to potential chemical content. Garden designer Charlotte Sanderson, also a gold award winner at the RHS Badminton Flower Show, recommends watering early in the morning or late at night for maximum effectiveness and not neglecting shaded areas, which can still be very dry.
Protecting the soil itself is paramount for plant health during hot spells. Ollie Jamieson, director of Lush Greens, a market garden in Bristol, advocates for generous mulching. Applying a thick layer of organic material, such as woodchip, compost, or straw, to bare soil offers multiple benefits. Mulch acts as an insulating layer, keeping soil cooler and significantly reducing water evaporation. It also helps suppress weeds, which compete with plants for precious moisture and nutrients, and can improve soil structure over time. Jamieson emphasises that a well-mulched garden requires less frequent watering, saving both time and money.
These expert recommendations offer a multi-faceted approach to creating more resilient gardens in the face of rising temperatures. From strategic planting to smart water management and soil protection, gardeners can adapt their practices to ensure their green spaces not only survive but thrive, contributing to local biodiversity and personal well-being. Implementing these measures can also lead to noticeable reductions in household water consumption, providing a financial benefit alongside environmental gains.