Plants can help homes stay cooler in a variety of ways. As climate change brings more frequent and intense summer heat to many parts of the world, homeowners are looking for affordable and sustainable ways to stay comfortable. Using the right plants in your garden can be an effective, natural solution. With autumn planting season now underway, it's a good time to plan for the upcoming summer. Planting now can give climbers and shrubs time to establish themselves before the warmer months. After recent heatwaves, many people are seeking ways to manage the increasing frequency of extremely hot days. However, this doesn’t necessarily mean investing in expensive air-conditioning units. Even those with a small garden or balcony can benefit from the cooling effects of plants. In a way, plants act like nature's own air conditioners, offering a more affordable and eco-friendly alternative. Plants help reduce heat in three main ways. First, they create shade, which reduces the amount of sunlight absorbed by hard surfaces like roads and driveways, which in turn radiate heat back as infrared radiation. Second, plants use a process called evapotranspiration, where they convert water into vapor, which dissipates heat without raising the temperature. This keeps both the plant and its surroundings cool. Third, some plants reflect sunlight back into space due to their leaf properties, such as color and texture. Silver-leaved plants, for example, are particularly effective at this, including species like Colorado spruce, blue festuca grass, and lamb’s ear. Researchers have long understood that plants can cool buildings in the summer and provide insulation in the winter. However, many of the systems used in commercial buildings, such as green walls and roofs, can be costly and complex for the average homeowner to install. Yet, the same cooling benefits can be achieved with simple garden plants. Whether they're part of a sophisticated design or just a few shrubs or climbers, plants can provide both aesthetic value and practical cooling. For example, wall climbers like wisteria or trees strategically placed to block sunlight can significantly reduce the temperature of a home. In addition to cooling, plants can enhance the beauty of a home and provide food. Research has shown that placing plants in front of a south-facing brick wall can reduce surface temperatures by as much as 25°C. However, not all plants are equally effective. Ivy and honeysuckle are particularly good at cooling, while others like winter jasmine and rockrose are less effective. Shade-providing plants like cherry laurel and evergreen viburnums are best for blocking the sun, while plants like hydrangeas and clematis, which rely on evaporation for cooling, need consistent water. Combining different types of plants around a wall can create a variety of cooling effects. Leaving a small air gap between the plants and the wall can further enhance this cooling by allowing air to circulate. The benefits of using plants extend beyond the house itself. Thoughtful placement of shading and evapotranspiring plants can make patios and play areas more comfortable. Researchers are also exploring the use of movable potted plants to cool areas near windows and balconies. Creating a green facade on a home's south-facing wall is a cost-effective and environmentally friendly alternative to air conditioning, which can produce emissions and contribute to urban heat. A wide range of plants can be used for cooling, including climbing annuals like nasturtium and morning glory, as well as flowering annuals and biennials. These can be grown from seed at a relatively low cost. For those with a bit more budget, perennial climbers like roses, clematis, and wisteria can provide long-term cooling benefits and add beauty to a garden. These plants not only help keep homes cooler but also offer visual appeal, fragrance, and a peaceful, natural ambiance.