While trees in the Maryland area are built to handle the cold, our specific “freeze-thaw” climate creates unique hazards. Unlike the consistent cold of the North, Maryland often swings from 60 degrees to 20 degrees in a single week. This volatility is exactly what causes the most significant winter tree damage.
At Nelson Tree Specialist, we see the aftermath of these temperature swings every spring. Understanding how winter damages your trees is the first step in protecting your property value and landscape.
1. Frost Cracks and Sunscald
Have you ever seen a deep, vertical split in the bark of a tree on a sunny winter day? This is a Frost Crack. In Maryland, the winter sun can warm up the bark on the south or southwest side of a tree during the day, causing cells to “wake up” and expand. When the sun sets and the temperature plummets, those cells freeze and contract so quickly that the bark literally rips open.
Most Vulnerable: Young trees with thin bark, specifically Maples, Cherries, and Fruit Trees.
Prevention: Wrapping the trunk with tree wrap or burlap reflects the sun and keeps the bark temperature consistent.
2. Winter Desiccation
Evergreens don’t go fully dormant; they continue to “breathe” through their needles all winter. When the ground is frozen, the roots cannot pull up water. If we have a windy, dry Maryland winter, the wind pulls moisture out of the needles faster than the tree can replace it.
The Result: “Winter Burn”, the brown, crispy needles you see on Arborvitae, Boxwoods, and Pines in March.
Prevention: Deep watering before the ground freezes and applying anti-desiccant sprays in late autumn.
3. The Myth of “Safe” Snow
Contrary to popular belief, snow is a major threat to evergreens in our region. Maryland often sees “wet” snow (heavy, concrete snow) rather than fluffy powder. Because evergreens keep their needles, they act like giant paddles that catch and hold this weight.
Without proper structural pruning, even a healthy Pine or Cedar can suffer catastrophic limb failure under the weight of a single heavy storm.
4. Salt Damage: The Silent Killer
If your trees are located near a road or sidewalk that gets treated with salt, they are at risk. De-icing salt (sodium chloride) pulls moisture away from tree roots, creating a “drought” condition even in wet soil.
Symptoms: If your trees look stunted or “burnt” only on the side facing the road (the “spray zone”), salt is likely the culprit.
The Fix: Flushing the soil with water and using Gypsum treatments to neutralize the salt.
How to Protect Your Trees This Winter
You don’t have to leave your trees to the mercy of the elements. Here is how we help Maryland homeowners prepare:
- Mulch Early: A thick layer of mulch acts as an insulator, slowing down the freeze-thaw process in the soil and keeping roots hydrated.
- Anti-Desiccant Sprays: For prized evergreens, we can apply a “waxy” coating that helps lock moisture into the needles during the windiest months (January–February).
- Structural Pruning: Thinning out the canopy in late fall allows snow to fall through the branches rather than piling up on top of them.
Don’t Wait for the Spring Thaw
Damage that happens in January often doesn’t show up until May, when it might be too late to save the limb. If you’re worried about a leaning tree or a new crack in the bark, an inspection from an ISA Certified Arborist can save you thousands in removal costs later.
Is your landscape prepared for the next Maryland ice storm?
Schedule a Winter Health Checkup or call 301-854-2218 to protect your trees today.