Water Wisely – Late summer often brings hot, dry conditions. Continue watering your trees—especially newly planted ones—through fall until the ground freezes. Aim for deep, infrequent watering rather than light, frequent watering. Trees need about 10 gallons of water per inch of trunk diameter per week. Avoid overwatering; soggy roots can be just as harmful as drought stress.
Hold Off on Fertilizer – Fertilizing trees in late summer can encourage new growth that may not harden off before winter. Instead, wait until late fall or early spring when the tree is preparing for new growth. If you suspect nutrient deficiencies, a soil test is a smart first step.
Mulch Matters – Refresh mulch around the base of your trees to help conserve soil moisture, regulate temperature, and suppress weeds. Keep mulch 2–4 inches deep and avoid piling it against the trunk ("volcano mulching"), which can lead to rot and pest problems.
Inspect and Prune – Now is a good time to inspect your trees for dead, damaged, or diseased branches. Prune only as necessary, and wait until trees are fully dormant (late winter) for more extensive structural pruning. Avoid major pruning in early fall, as it can stimulate growth and reduce winter hardiness.
Watch for Pests and Disease – Late summer is prime time for some tree pests and diseases. Keep an eye out for abnormal leaf drop, discolored foliage, or dieback at branch tips. Early detection makes management easier and more effective.
Prepare for Planting – Fall is an excellent time to plant trees, thanks to cooler temperatures and moist soil that encourage strong root growth. If you’re considering adding new trees to your landscape, start planning now. Choose species suited to Kansas conditions, paying attention to mature size, soil preferences, and sun exposure.
By giving your trees a little extra care in late summer and fall, you help ensure they go into winter strong and come out thriving next spring.
For more tree care tips, feel free to contact the K-State Extension Cottonwood District office—we’re here to help!
As summer begins to wind down and we transition into fall, it’s a crucial time to give your trees the attention they need to remain healthy and resilient through the changing seasons. Trees may look like they’re coasting into dormancy, but what you do now can significantly impact their long-term health and structure.
Late Summer and Fall Tree Care: Set Your Trees Up for Success