By Nancy Penrose
Mid-summer heat can put even the healthiest trees under stress. Between rising temperatures, longer dry spells, and a surge in insect activity, this time of year presents a unique set of challenges for homeowners who want their landscapes to stay green and vibrant.
Fortunately, a few consistent care practices around watering, pruning, and pest control can make a significant difference in how well trees handle the peak of summer, and knowing what to look for now can help ensure a strong recovery once cooler weather returns.
Watering: The Foundation of Summer Tree Health
Water is the single most important factor in mid-summer tree care. As temperatures climb, trees lose moisture more quickly through their leaves, and soil can dry out faster than many homeowners expect, especially in areas with sandy or compacted soil.
Deep, infrequent watering is generally more effective than frequent shallow watering. Soaking the soil thoroughly encourages roots to grow deeper, where they are better protected from heat and drought stress. A slow trickle from a hose, a soaker hose, or a drip irrigation system placed near the base of the tree allows water to penetrate the root zone rather than running off the surface.
Newly planted or young trees typically need more frequent watering than mature, established trees, since their root systems have not yet spread wide enough to access deeper soil moisture. Mulching around the base of a tree, while keeping mulch several inches from the trunk, helps retain soil moisture, moderate soil temperature, and reduce weed competition.
Homeowners should check soil moisture regularly rather than watering on a fixed schedule. A simple way to do this is to insert a screwdriver or soil probe a few inches into the ground; if it meets resistance and the soil feels dry, it is time to water.
Pruning: Timing and Technique Matter
While major structural pruning is usually best reserved for late winter or early spring, mid-summer is a good time for light, selective pruning. Removing dead, damaged, or diseased branches helps improve air circulation, reduces the risk of pest infestations, and can prevent small problems from becoming larger ones.
Summer pruning can also help control the size and shape of fast-growing trees, since it is easier to see the full canopy once leaves have filled in. However, homeowners should avoid heavy pruning during extreme heat, as removing too much foliage at once can increase stress on the tree and expose previously shaded bark to sunscald.
When pruning, use clean, sharp tools and make cuts just outside the branch collar rather than flush against the trunk. This allows the tree to heal properly and reduces the risk of decay entering the wound. Tools used on a tree showing signs of disease should be disinfected between cuts to avoid spreading the problem to healthy branches.
Pest Control: Watching for Summer Threats
Warm weather brings increased activity from many common tree pests, including aphids, spider mites, borers, and various types of caterpillars. Mid-summer is an important time to inspect trees regularly for early signs of infestation, such as discolored or curling leaves, sticky residue on foliage, small holes in bark, or sawdust-like material near the base of the trunk.
Stressed trees, particularly those affected by drought, are more vulnerable to pest damage, which makes proper watering an important part of pest prevention. Maintaining tree health through good watering and pruning practices reduces the likelihood of a serious infestation taking hold.
Treatment options vary depending on the pest species and severity of the problem. In many cases, targeted treatments or beneficial insects can manage the issue without broad chemical applications. Homeowners uncertain about the pest or the best course of action should consult a tree care professional to avoid ineffective or harmful treatments.
Putting It All Together
Watering, pruning, and pest control work together to support tree health through the summer months. Consistent deep watering reduces stress, light seasonal pruning removes vulnerabilities, and regular pest monitoring helps catch problems before they escalate. Homeowners who invest time in mid-summer tree care are protecting more than the appearance of their landscape. Healthy, well-maintained trees continue to provide shade, curb appeal, and long-term value for years to come.
Nancy Penrose is the owner of Big Trees Inc., located in Snohomish, WA in the Seattle area. The company is one of the largest tree nurseries in the Seattle area with over 120,000 trees available in over 300 varieties. They not only deliver young trees, but also mature trees in a wide range of sizes. Some types of trees available include fall color, spring flowering, deciduous, evergreen, and privacy trees. The company also does tree transplanting, including large trees. Their blog can be seen at https://bigtreesupply.com/blog/ or http://arboristblog.com/. They can be reached at 360-563-2700.
Big Trees Inc.
10928 Springhetti Rd
Snohomish, WA 98296
360-563-2700
