Horticultural expert Roger Eavis, proprietor of Greenshutters Garden Centre, has advised that keeping the soil around Japanese maples consistently damp is essential to prevent dieback and ensure the trees remain "healthy and vigorous all summer." He emphasized that well-watered trees "will reward you with incredible autumn colours."
Watering Tips for Summer
During hot weather, Japanese maples in pots should be watered once a day, while those planted in the ground need watering two or three times a week. If leaves appear dry or scorched, it is likely due to lack of moisture, which is "by far, the main cause of dieback," according to Eavis. He also suggested planting them where they receive partial shade if watering is inconsistent.
Monitoring Soil Moisture
To avoid overwatering or underwatering, check soil moisture by pressing a finger or moisture meter one to two inches into the ground. If it feels dry at that depth, it's time to water. Deep watering is crucial: use a hosepipe for several minutes or a sprinkler for longer to encourage deeper root growth, making trees more drought-resilient.
Best Practices for Pots and Timing
For potted maples, water until it drains from the base to ensure the entire root system is hydrated. Watering in the morning is ideal to reduce evaporation. Always water at the roots, as Japanese maples absorb moisture only through their root system, not through leaves.
