Tree and Shrub Care in Summer: 5 Things Most Homeowners Forget Until It's Too Late
Lawn Squad • June 2026
Deep root watering, mulch placement, scale insects, bagworms, and summer diseases — the five items most homeowners skip. A single mature shade tree carries $5,000–$20,000 of property value. Replacement runs $1,500–$5,000, not counting the years of growth. A small annual program protects an outsized investment.
Why Trees and Shrubs Pay the Bigger Bill When Things Go Wrong
It is mid-June, the lawn is being mowed every week, and everything checks out. Three months from now, the arborvitae screen along the fence will have a thin spot and the magnolia will be dropping leaves it should not be. Lawns get the attention. Trees and shrubs pay the bigger bill when they go wrong. A mature shade tree carries $5,000–$20,000 of property value. Mature ornamentals — boxwoods, Japanese maples, azaleas, hydrangeas — carry hundreds to thousands more. Most homeowners do nothing for these plants between the day they were planted and the day they start dying.
1. Deep Root Watering on Young and Established Trees
Lawn irrigation does not water trees. Sprinkler heads wet the top few inches of soil. Tree feeder roots run 12–24 inches deep on mature trees and need correspondingly deep moisture. A tree depending on lawn sprinklers is constantly thirsty, even when the grass looks fine.
Newly planted trees (first three to five years) are the most vulnerable. Their roots have not extended far beyond the original root ball. In summer, they need a slow soak right at the root ball one to two times per week. A soaker hose looped around the trunk run for an hour delivers more useful water than a week of sprinkler cycles.
Established trees, twenty years and older, are not bulletproof. They can lose feeder roots in extended drought even when they look fine, and the damage shows up two to three years later as crown dieback. A monthly deep soaking in June, July, and August at the drip line is cheap insurance.
The method: place a soaker hose in a ring at the drip line, run it on low pressure for two to four hours, and let the water move slowly into the soil. Total water delivered: 15–30 gallons for a small tree, 50–100 gallons for a mature shade tree.
2. Mulch Depth and Placement (The Mulch Volcano Problem)
Walk almost any suburban neighborhood and look at the base of the trees in front yards. Many will have a cone-shaped pile of mulch pulled up against the trunk, six to twelve inches high. These are called mulch volcanoes, and they are killing trees slowly across the country.
The Wrong Way: Mulch Volcano
Mulch piled against the bark holds moisture continuously, softens bark, invites fungal pathogens, and creates an environment for boring insects. It also encourages roots to grow upward into the mulch, creating girdling roots that strangle the trunk decades later.
The Right Way: The Doughnut
Two to three inches deep, spread in a circle out to the drip line, pulled back two to four inches from the trunk so you can see the root flare. The doughnut shape conserves moisture, suppresses competing turf, and lets the bark breathe.
June is a good time to fix existing mulch problems. Pull the mulch back from the trunks of every tree and shrub. If you see roots circling the trunk in the mulch, those are girdling roots that should be cut. If the bark is wet, soft, or discolored under the volcano, that is a sign of damage already done.
3. Scale Insect Inspection on Hollies, Magnolias, and Euonymus
Scale insects are some of the most damaging and most overlooked ornamental pests. They look like small bumps, scales, or scab-like spots on stems and the undersides of leaves. Many homeowners assume the bumps are part of the plant. They are not — they are sap-sucking insects under a waxy or armored cover.
Magnolia Scale
Large brown or pink bumps on magnolia stems, up to half an inch across. Honeydew drips from infested trees onto cars and patios. Black sooty mold grows on the honeydew.
Euonymus Scale
White or brown small flecks on euonymus leaves and stems, especially on undersides. Heavy infestations turn entire shrubs yellow and stressed.
Holly, Oak & Pine Scale
Species-specific scales affecting holly tea, oak lecanium, and white pine similarly — sapping strength and causing visible decline over one to two seasons.
Scale insects move through a vulnerable crawler stage in early summer (late May through mid-July). That window is when contact treatments are most effective. June is the prime scouting and treatment month. A horticultural oil application during the crawler window can knock down a population dramatically. Waiting until September means another year of damage.
4. Bagworms on Arborvitae, Junipers, and Spruce
If you have an arborvitae privacy screen, a juniper hedge, or a spruce in the landscape, late May through July is bagworm season. Bagworms are the larvae of small moths, constructing distinctive cone-shaped silken bags 1–2 inches long, covered in bits of the host plant's needles or leaves. They hang from branches and look exactly like small pine cones.
A young infestation might be 20 to 50 bags on a single arborvitae. By the end of summer, that can become hundreds, and the host plant is partially defoliated. Arborvitae and junipers do not recover well from heavy defoliation.
The treatment window is when the larvae are small and actively feeding. Bacillus thuringiensis (Bt) is highly effective on small bagworms and is essentially harmless to beneficial insects, birds, and pets. Time it mid-to-late June across most of the country. Wait until August and even strong insecticides are minimally effective.
5. Disease Watch on Dogwoods, Oaks, and Cherries
Several common ornamental and shade trees have specific summer diseases that show up in June or July and need treatment timed to active infection, not symptoms.
Dogwood Anthracnose
Pinkish-brown spots on dogwood leaves, twig dieback — worst in wet humid summers. Preventive fungicide programs in spring and early summer protect susceptible trees.
Oak Wilt
Browning of oak leaves starting from the tips on red oaks. Pruning during April through July is a major risk factor. Wait until winter for any oak pruning.
Cherry Leaf Spot
Yellowing leaves with small purplish spots, premature leaf drop on ornamental and fruit cherries. Sanitation plus preventive fungicides break the cycle.
Apple Scab on Crabapples
Dark olive spots on leaves and fruit, premature defoliation by August. Preventive program in spring is the key, but inspection in June tells you if you missed the window.
Boxwood & Volutella Blight
Brown spots and rapid defoliation on boxwood during humid weather. The disease can move through a hedge fast. Early diagnosis matters enormously.
What an Annual Tree and Shrub Program Actually Covers
A formal annual tree and shrub care program is not the same thing as a lawn fertilizer program. The work is different, the chemistry is different, and the visits are scheduled differently.
Spring Dormant Oil
Suppresses overwintering scale, mites, and other pests before bud break.
Crawler-Stage Treatment
Insecticide timed to species and region for scale and other early-summer pests.
Bagworm Treatment
Late June or early July with Bt or other low-impact chemistry.
Disease Prevention
Targeted programs on dogwoods, crabapples, cherries, and other susceptible species.
Deep Root Fertilization
Fall application delivers nutrients to the root zone at depth where feeder roots actually take them up. Surface fertilizer for trees is largely wasted.
Late-Season Inspections
For borers, scale that escaped earlier treatments, and other end-of-year items.
The total program cost on a typical residential property runs $400 to $1,200 per year depending on the number and type of plants, regional pricing, and what is included. Compared to replacing a single mature tree, the math is friendly.
What to Do Next
Walk your property this weekend with this list in hand. Look at the base of every tree for mulch volcanoes. Check magnolias and hollies for scale bumps. Inspect arborvitae and juniper for bagworms. Look at dogwood and cherry leaves for spotting. Note any tree planted in the last five years that has not had a deep watering in three weeks. The walk takes thirty minutes and tells you what your property actually needs.
Lawn Squad has local teams with tree and shrub specialists trained on the species and pressures in their specific region. Our VitaminLawn program pairs naturally with a tree and shrub care program for customers who want a single team handling everything on the property.