Spring is here—and with it, a much-needed soaking rain. But don’t be fooled into thinking that one deep rainfall will undo the damage caused by five consecutive years of drought. In fact, the lingering impact of previous environmental stressors is catching up with many local trees, leading to a condition known as leaf delay.
At Tree Green, we’ve been in the tree care business for 55 years, and just when we think we’ve seen it all, nature throws us something new. This year, it’s the slow or uneven leaf-out on a variety of species across the region—an issue that can be traced to past challenges more than present conditions.
What’s Causing Leaf Delay?
Many homeowners are noticing that their trees are struggling to leaf out as usual this spring. The culprit? A perfect storm of environmental stressors—both past and present.
Between 2008 and 2019, our region experienced a series of unusually wet years, leaving soil heavily saturated. While this seemed good for lawns, it actually caused a hidden issue underground: root rot. When water fills the soil for extended periods, oxygen can’t reach tree roots. Without enough oxygen, roots begin to die off—weakening the tree’s ability to absorb water and nutrients for years to come.
Then, beginning in 2020, we entered an extended drought period. With little snow in winter and dry springs, summers, and falls, those already-compromised root systems have had little chance to recover. The result? Trees are now operating with fewer, weaker roots, and it’s catching up with them.
It’s Not Just the Drought
While drought plays a major role, other factors are contributing to this year’s stress as well:
- A wet March helped slightly, but was followed by a frosty April, damaging buds that were just beginning to open.
- These conditions are ideal for a foliar fungus called Anthracnose, which can stunt or kill developing leaves.
- May was the 11th driest in 158 years of recordkeeping, suggesting that drought conditions may continue into a sixth straight summer.
Add in our region’s common clay soils, poor drainage, and nutrient deficiencies, and it’s no wonder trees are struggling.
When trees experience this level of stress, they often delay leafing out as a defense mechanism—conserving energy to protect themselves. While many of these trees will eventually open their leaves later in the summer, those leaves may be smaller and less abundant. In some rare cases, severely stressed trees may not recover.
What You Can Do to Help Your Trees
If your trees look distressed or bare, don’t panic—but don’t ignore them either. Here are some practical steps to support your trees through recovery:
1. Change How You Water
Avoid shallow, frequent watering (like 15 minutes every other day). Instead, deep-water your trees for a few hours every 10–14 days. This allows moisture to reach deeper into the soil, encouraging healthier root growth and preventing waterlogged topsoil.
2. Root Fertilization
Applying the right fertilizer to the root zone can replenish critical nutrients and minerals, giving struggling roots the boost they need to regain strength and function.
3. Call an Expert
If you notice sparse foliage, early leaf drop, or branches that aren’t leafing out at all, schedule a consultation with our certified arborists. Our team can assess the issue and determine the best course of action.
Need Help with a Tree in Trouble?
Tree Green MD has been helping trees recover and thrive since 1970. Whether you’re concerned about a single tree or the health of your entire property, we’re here to help. Give us a call or request a free evaluation today, and let’s work together to keep your trees strong—no matter what weather comes their way.
