When the summer heat rolls into Illinois, your trees feel it just as much as you do. While many mature trees are relatively resilient, hot and dry conditions can take a toll on their health—especially younger trees, newly planted specimens, and species sensitive to drought. With increasing weather extremes and longer periods of dry, hot weather, it’s more important than ever to fine-tune your summer tree care strategy.

Here are expert tips from Homer Tree Care to help your trees stay hydrated, healthy, and heat-resilient through the peak of summer.

Prioritize Tree Hydration

Watering is the single most important step in summer tree care, particularly during dry spells. Trees under heat stress can show signs of wilting, browning edges, early leaf drop, or even dieback. To support their health, follow these tree hydration tips:

• Water deeply and infrequently. It’s better to give trees a deep soak once or twice a week than to apply shallow water daily. Deep watering encourages strong, deep root growth that helps trees survive future droughts.
• Focus on the root zone. The critical root area extends out about 1.5 to 2 times the width of the canopy. Use a soaker hose or slow trickle method to hydrate this area.
• Water early or late. Watering in the early morning or evening reduces water loss to evaporation and helps trees absorb more moisture.

Young and newly planted trees need extra attention. These trees often have smaller root systems and require more frequent watering—usually 5–10 gallons per week, depending on weather conditions and soil type.

Refresh Your Mulch

Mulch is a low-effort, high-reward way to support tree care in hot weather. A fresh layer of organic mulch provides several benefits:

• Retains soil moisture by reducing evaporation.
• Moderates soil temperature, insulating roots from extreme heat.
• Suppresses weeds, which can compete for water and nutrients.
• Improves soil structure as it decomposes over time.

Apply 2–4 inches of mulch in a wide, donut-shaped ring around the base of the tree—but never pile it against the trunk. “Mulch volcanoes” can cause bark decay and invite pests or disease.

Monitor mulch throughout the season and replenish as needed. Especially during summer, decomposed mulch can lose its effectiveness in retaining moisture.

Watch for Signs of Heat Stress

Heat stress in trees can show up in a few distinct ways. Keep an eye out for:

• Scorched leaves: Crispy, browning edges or entirely wilted foliage.
• Early leaf drop: Trees dropping leaves in summer to conserve moisture.
• Stunted growth: Lack of new growth or smaller-than-usual leaves.
• Cracked bark or increased insect activity due to stressed tissues.

If you suspect a tree is stressed, consult a certified arborist. Heat stress can sometimes mimic symptoms of disease or insect problems, and catching issues early can prevent long-term damage.

Bonus Tips for Summer Tree Care in Illinois

• Hold off on major pruning. Summer isn’t the best time for aggressive pruning. Light shaping or removing dead limbs is fine, but wait until dormant seasons for larger cuts.
• Avoid fertilizing stressed trees. Fertilizer can encourage growth when the tree needs to focus on conserving resources. If fertilizing is necessary, do so in early spring or late fall.
• Protect young trees from lawn equipment. Damage to bark can reduce a tree’s ability to move water and nutrients—avoid trimming too closely or bumping into trunks.

Call the Tree Care Professionals

Hot Illinois summers can put your trees to the test—but with proper care and attention, they can thrive through even the driest stretches. At Homer Tree Care, our certified arborists are here to help assess your trees, recommend appropriate watering and mulching strategies, and diagnose any signs of heat-related stress.

Whether you’re caring for a mature oak or nurturing a newly planted maple, contact Homer Tree Care for expert advice and support.