Good pruning is selective. Each cut should have a reason: removing dead or broken wood, clearing a roof or driveway, correcting a weak structure, or letting in light. Bad pruning, particularly "topping," creates more problems than it solves.
Types of pruning
Deadwooding
Removing dead, dying and broken branches. It is the most common safety pruning and especially valuable over driveways, patios and play areas.
Clearance pruning
Raising the canopy over sidewalks and driveways, and pulling branches back from roofs, gutters and chimneys. Branches rubbing a roof damage shingles and give squirrels a ladder.
Structural pruning
On young and middle-aged trees, gradually favoring one dominant leader and well-spaced branches. This prevents the weak co-dominant forks that so often split in storms.
Crown thinning and reduction
Selectively removing some branches to reduce weight on long limbs or reduce height or spread, using proper reduction cuts back to a lateral branch.
Why topping is a mistake
Topping cuts large branches back to stubs. The tree responds with a mass of fast, weakly attached sprouts, while the stubs decay. A few years later the tree is just as tall, structurally weaker, and needs more work. If someone proposes topping your tree, get a second opinion.
Timing
Dead or hazardous wood can be removed any time. For many trees, late winter dormancy is a good time for structural pruning: the branch structure is easy to see and the tree is ready to seal wounds in spring. Some trees bleed sap when pruned in late winter; it looks dramatic but is generally not harmful. Flowering trees are often pruned right after bloom. Oaks deserve special care in areas affected by oak wilt, where pruning during the growing season can raise infection risk. Ask an arborist about timing for your species.
How much to take
Removing too much live canopy at once stresses a tree. A conservative approach, removing only what is needed, protects the tree's ability to feed itself. Expect a reputable crew to explain what they will remove and why.
Climbing spikes
Spikes (gaffs) wound the trunk and should not be used on trees being pruned and kept. Roanoke's city code even prohibits climbing irons on live trees for permitted work on city property. Professionals use ropes and lifts instead.
Trees near power lines
Do not prune branches near energized lines yourself or hire an unqualified crew for it. Contact the utility, which manages line clearance.
Timing pruning by species
For many trees, timing is flexible, but a few species have clear preferences. Virginia Cooperative Extension's deciduous pruning calendar favors dormant-season pruning for oaks, and Extension-affiliated guidance specifically recommends avoiding oak pruning from March through August to reduce the risk of oak wilt. Some trees, such as maples, bleed sap when pruned in late winter; the calendar notes this is more cosmetic than harmful. Flowering trees that bloom on old wood are often pruned right after bloom to avoid removing flower buds. Storm damage, of course, is pruned whenever it happens. Our ash and oak guide explains the oak wilt reasoning.
How often?
Mature shade trees near homes often benefit from a check every few years, with deadwood removal as needed. Young trees benefit from structural pruning early, which is quick and inexpensive and prevents defects that would be costly to correct later.
Pruning versus removal
If you are deciding between the two, see remove or trim?
Use our free quote form to schedule a pruning estimate.
Types of pruning cuts and jobs
- Crown cleaning: removing dead, diseased, broken and crossing branches. The most common and useful job.
- Crown raising: removing lower limbs to clear roofs, driveways, sidewalks or views.
- Crown reduction: shortening long limbs back to a lateral branch to reduce weight or clearance, done properly rather than by topping.
- Structural pruning: shaping young trees so they develop one strong leader and well-spaced branches.
Why topping is a bad idea
Topping (cutting large branches back to stubs) is widely discouraged by arborists. It leaves big wounds that decay, triggers weakly attached sprouts, and often makes a tree more dangerous within a few years. If someone offers to "top" a tree to make it safer, get a second opinion.
How much to remove
Good practice is to take only what is needed. Removing too much live canopy at once stresses a tree. At Smith Mountain Lake, the shoreline vegetation rules even put a number on it: pruning exemptions are limited to 20% of the canopy or 14 feet, whichever is less.
Timing by species
Most deciduous trees can be pruned in the dormant season. Oaks should be pruned in late fall or winter and not March through August, per Virginia Cooperative Extension guidance. Dead or hazardous limbs can be removed any time.
Clearance pruning around homes
Branches rubbing a roof wear shingles and give squirrels a ramp to the attic. A common rule is to keep limbs several feet off the roof and away from chimneys. Over driveways and sidewalks, raise the canopy so vehicles and people pass easily, but avoid stripping lower limbs so heavily that the tree becomes top-heavy.
Pruning young trees
A few minutes of structural pruning in a tree's first years prevents expensive problems later. The goal is a single dominant leader, branches spaced along the trunk, and removal of branches with narrow, V-shaped unions that trap bark and split later.
After storm damage
Broken limbs should be cut back to a healthy branch or the trunk collar, not left as jagged stubs. Hangers (broken limbs lodged in the canopy) are dangerous and should be removed promptly by someone with the right equipment.
Common questions
How often should trees be trimmed?
Mature shade trees often need attention every few years; young trees benefit from structural pruning more often. Inspect after major storms.
Can I trim branches hanging over from my neighbor's yard?
Rules vary; talk with your neighbor first and avoid damaging the tree. For trees on city property, a permit is required.
Is tree trimming cheaper in winter?
Some companies have more availability in winter, which can help with scheduling and sometimes price.