In the hot season, the toll that drought takes on trees is hard to ignore. Trees provide shade, cleaner air, and essential cooling, but many already show signs of decline. “Decades of environmental stress, including compacted soil from development, improper watering practices, and shifting landscapes have left our trees vulnerable,” says ISA-certified arborist Mike Holleran with The Davey Tree Expert Company in Wilmington.
To determine if your trees need help, look for thinning canopies, dead branches, or early leaf drop, Holleran says. These are warning signs that a tree is struggling to absorb water and nutrients.
The good news is there are steps you can take now. Deep, infrequent watering encourages stronger roots, while mulching helps soil retain moisture. Avoiding unnecessary soil compaction and preserving mature trees in development projects also makes a difference, as well as working with a professional to apply deep root fertilization.
To help trees survive drought, water deeply and slowly in the morning, focusing on the area under the branches (called the drip zone) while avoiding the trunk. Use a sprinkler or drip hose to let water soak in gradually. To prevent overwatering, run the sprinkler slowly until a few centimeters of water are collected in a can underneath. Mulch around the base with wood chips, leaves, or pine needles to retain moisture, keeping it away from the trunk to prevent rot.
Interestingly, overwatering can weaken trees, making them less adaptable to drought. “Thoughtful, sustainable care is key to resilience,” Holleran says.
If you’re unsure about the health of your trees, contact your local arborist for customized recommendations. They can assess potential risks, provide guidance on proper watering, and help you develop a plan to keep your trees strong through all seasons.
