Japanese maples can be prone to shedding their leaves in summer – adding one simple item to the soil could help keep them vibrant and healthy10:04, 02 Jul 2026Japanese maples ought to be displaying vibrant colours this month, yet these delicate trees may lose their leaves early without proper watering during July. Gardeners need to stay alert with their Japanese maples when temperatures rise, as their shallow root systems can find it difficult to retain moisture.‌Fortunately, this can be remedied. With abundant sunshine, the soil surrounding Japanese maples can dry out quickly, making their foliage vulnerable to sun damage. Without attention, leaves may curl, wilt, and fall off, leaving the tree bare throughout the summer.‌However, Kiersten Rankel from Greg, a plant care specialist, has pointed out that keeping your Japanese maple well-watered in hot weather is straightforward when you apply mulch, reports the Express.‌Kiersten advised: "Summer's heat demands vigilance. Your tree's not just surviving; it's trying to thrive. Deep, less frequent watering beats shallow daily sips."Mulch is your ally, keeping roots cool and moist. Remember, a well-watered maple won't throw shade but will surely appreciate it."‌Mulching, which involves adding organic material to the top layer of a plant's soil, not only improves it but during warmer periods, it also acts as a reservoir for water retention.This stored moisture from the mulch gradually filters into the ground, keeping the Japanese maples adequately hydrated and healthy, allowing them to continue producing their striking red foliage throughout the summer. Placing a layer of mulch around Japanese maples shields the leaves from scorching while also keeping weeds at bay, cutting down on one of summer's most tiresome gardening chores.‌Lightweight mulches that retain a good amount of moisture are best suited to Japanese maples, including pine bark, wood chips, garden compost or leaf mould.Steer clear of nitrogen-rich mulches such as cow manure, as these encourage excessive growth, which can put Japanese maples under unnecessary strain during warmer months when they need to conserve their energy.When laying mulch, spread an even, thin layer around the base of the tree, keeping it well clear of the trunk, as too thick a covering can prevent the roots from breathing properly.Article continues belowOnce your Japanese maples have been mulched, give the soil a thorough soaking once a week to keep the tree cool throughout the warmer months.By mulching and watering your Japanese maples deeply, the leaves should stay a vivid red all summer long, letting you sit back and enjoy a flourishing garden without constantly reaching for the watering can.