Is Your Tree Thirsty? How to Spot the Signs of Drought Stress
Just like people, trees get stressed when they’re not getting enough water — especially during hot, dry southern Alberta summers. But unlike your lawn, a thirsty tree won’t turn brown overnight. The signs are often subtle at first, and catching them early can make all the difference.
In this post, we’ll show you how to spot drought stress in your trees and what you can do to help them recover and thrive.
Early Warning Signs of Drought Stress
Curling or wilting leaves
Leaf edges turning brown or crispy
Leaves that are smaller than normal
Premature leaf drop (especially in mid-summer)
Sparse or thinning canopy
New growth that is stunted or delayed
Why Trees Struggle in Dry Conditions
Even well-established trees can suffer during extended dry spells. Lethbridge and the surrounding areas are known for their wind and fluctuating rainfall — both of which pull moisture from the soil faster than roots can absorb it.
Young trees, recently transplanted trees, and shallow-rooted species (like birch or poplar) are especially vulnerable.
How to Help a Thirsty Tree
1. Water Deeply — and Less Often
Shallow watering leads to shallow roots. Instead, water slowly and deeply once every 7–10 days. Use a hose or drip system at the tree’s dripline (where the branches end), and let it run for 45–60 minutes.
2. Mulch Smart
Apply a 2–4” layer of natural wood mulch around the base of the tree to help retain soil moisture and reduce evaporation. Keep mulch a few inches away from the trunk to prevent rot.
3. Schedule a TreeRx Health Check
If you’re unsure whether your trees are getting enough water — or showing signs of other stress — a mid-season health check can catch problems before they escalate. Our TreeRx program offers personalized care plans to keep your trees strong and healthy all season long.
Worried your tree might be thirsty?
Let us take a look. Book a TreeRx tree health check and we’ll help you build a care plan tailored to your property.
