Japanese maples have become incredibly popular in British gardens due to their vibrant foliage, but they require a bit of extra care to flourish in the UK climate.
Why Japanese Maples Need Special Attention
These trees naturally grow in woodland settings beneath larger trees in Japan, meaning they are typically shielded from direct sunlight, while fallen leaves on the ground help retain moisture to keep them well-watered. However, Japanese maples have shallow root systems, meaning they can often dry out rapidly in the UK once temperatures rise, causing their leaves to turn brown. This can frequently make Japanese maple leaves appear wilted or crispy, but in severe cases, they may fall off and cease growing entirely for the remainder of the season.
The Simple Solution: Mulching
Tom Warren, a gardener known as The Plant Doctor online, has revealed there is a straightforward method to protect Japanese maples during hot spells. You simply need some pine straw. Tom said: "One thing that will help your Japanese Maple out tremendously in high heat environments is mulch. When you mulch Japanese maples, I want you to use some sort of organic material. I prefer pine straw, it works great for me, or you can use pine bark nugget."
Why Mulching Japanese Maples Is Important
Mulching is a straightforward gardening method of laying organic matter around a plant, which enriches the soil with nutrients and insulates the roots, helping keep them cooler. Mulching is one of the most effective methods of protecting Japanese maple roots, which tend to grow close to the surface, acting as a shield against exposure to heat. Mulch also reduces water evaporation, preventing the sun from completely drying out the soil and keeping it moist for longer, meaning you will not need to constantly water them.
Pine straw is widely regarded as an ideal mulch for Japanese maples, as its airy texture mimics the leaf litter found in their native growing conditions in Japan. It is worth bearing in mind that pine straw breaks down more quickly and will need topping up more regularly due to its lightweight nature. Pine bark, by contrast, is far more hardwearing and will go the distance. Pine straw tends to blend more naturally into garden settings, which is why many gardeners favour it over pine bark, which can appear chunkier — though either option is perfectly suitable.
How to Mulch a Japanese Maple
Simply start by clearing the area around the Japanese maple, removing any weeds, loosening the topsoil with a light dig, and watering the ground if it appears dry. Next, spread the mulch in a circular pattern around the tree, ensuring you leave a gap so it does not come into contact with the trunk. When mulch touches foliage or bark, it can trap excess moisture and lead to mould. The aim is to create a doughnut-like ring around the base of the tree. Once the mulch is in place, give it a thorough watering to help it bed into the soil — this should keep your Japanese maple in good health throughout the remainder of spring and summer.
