Tree trimming and pruning in Beaverton, Oregon
Deadwood out, weight off the long limbs, branches up off the roof and the sidewalk, fruit trees and hedges kept in shape. Every cut is made where the tree can close it. We don't top trees, and the drawing shows why where the saw goes matters more than how much comes off.
Harry Fauver, founder. Updated September 2026.
Where the cut goes.
One good pruning cut and three bad ones.The collar cut
Every branch joins the trunk through a swollen ring called the branch collar, and on top of the joint sits a raised line of bark, the branch bark ridge. A correct cut starts just outside the ridge and ends just outside the collar. The collar holds the tree's own defenses, so the wound stays small and new wood rolls over it in an even ring.
The flush cut
Cutting tight against the trunk looks tidy and does the most harm. It slices off the collar, makes a wound far larger than the branch, and opens the trunk itself to decay. Flush cuts were standard advice decades ago, and you can still find the hollow columns they left in older Beaverton maples.
The stub
Leave too much and the stub dies, because nothing is left on it to feed it. The collar tries to grow around dead wood and can't. The stub rots and becomes a tunnel for decay into the trunk. Stubs are the signature of pruning done from a ladder with whatever could be reached.
Topping
Topping cuts straight across the main stems at a chosen height. The tree loses most of its leaves at once and answers with a thicket of fast, upright sprouts attached only to the outer layer of wood, on top of cuts that are starting to decay. Within a few years it is as tall as before and much more likely to drop pieces. Beaverton prohibits topping street trees. We don't do it on any tree.
What a pruning visit covers
Tree trimming and tree pruning are the same work under two names. What matters is the goal, and a good estimate names it for each tree, so the crew isn't just "taking some off."
Crown cleaning
Dead, dying, broken and rubbing branches come out. It is the most useful pruning for a mature tree and the least stressful, since the tree gives up nothing by losing dead wood.
Clearance and crown raising
Branches come up off the roof, the gutters, the driveway and the street. Inside the city, trees over the public right-of-way have to clear 8 feet over sidewalks and 12 to 14 feet over the roadway, and the owner next to the tree is the one responsible.
Reduction
Long, heavy limbs are shortened back to a side branch big enough to take over. This is the pruning that prevents ice-storm breakage in bigleaf maple, birch and ornamental pear. It is also the honest alternative to topping when a tree is crowding a house.
Structural pruning for young trees
A few small cuts in a tree's first ten years set one main trunk and well-spaced limbs. It's the best value in tree care, because it prevents the twin trunks and crowded forks that turn into removals thirty years on.
Fruit trees, hedges and shrubs
Apples, pears, plums and cherries are pruned for light, fruit size and a height you can pick from. Arborvitae, laurel and photinia hedges are sheared and lowered, and shrub trimming is usually done on the same visit.
When to prune in Beaverton
The calendar matters less than people think, with a few real exceptions. Pick a season.
Winter, December to February
The best season for structural pruning of most deciduous trees. The leaves are off, so crossing limbs, weak forks and old storm damage are easy to see, and the tree has the whole spring to start closing its wounds. Apples and pears are pruned late in winter. Maples and birches pruned now may drip sap for a few weeks, which looks alarming and does no harm.
Spring, March to May
Go lightly while the leaves are expanding, since the tree is spending its reserves. Spring-flowering trees such as cherry, magnolia and dogwood are best pruned right after they bloom, so you don't cut off next year's flowers. It is also nesting season. Active nests of most native birds are protected by federal law, so we check before we cut and work around them.
Summer, June to September
Dry weather is the safe window for cherries, plums and other stone fruit, because cuts made in the wet months invite bacterial canker and fungal disease. Summer is also good for slowing an over-vigorous tree, for clearance work, and for spotting deadwood against green leaves. Hedges are sheared once the spring flush has hardened. We avoid heavy pruning during heat waves, when trees are already short of water.
Fall, October and November
The poorest season for large cuts. Decay fungi release their spores in the autumn rain, and the tree is shutting down instead of sealing wounds. It's the right season for a different job: looking for the overextended limbs, cracked forks and dead tops that will fail under ice, and dealing with those before January.
The exception to every line above is risk. A dead, broken or cracked limb over a roof or a walkway comes out in whatever month you find it.
How much is too much
Leaves are how a tree feeds itself, so every live branch removed is income lost. The working rule is to take no more than about a quarter of the live crown in one year, and much less from a mature or stressed tree. An old oak or a drought-stressed cedar may tolerate a tenth.
Lion-tailing and "wind-sail" thinning
Stripping the inner branches and leaving tufts at the ends is called lion-tailing. It is often sold for Douglas-firs as wind-sail reduction. It makes a tree look thinned and it does the opposite of what is promised: weight moves out to the branch tips, the limbs whip harder, and the side branches that damp the sway are gone. What helps a fir in wind is removing dead and broken limbs and shortening the few that are overextended.
What we won't do
- Top a tree, on any species, at any height.
- Climb a tree we are pruning with spikes. Spikes are for removals, because every step is a wound.
- Paint wounds. Wound dressing doesn't stop decay and can trap moisture behind it.
- Prune within reach of energized high-voltage lines. That is work for PGE's line-clearance crews. The insulated service line to your house is different, and PGE can disconnect it for the day.
Beaverton's rules for pruning
Street trees. You maintain the tree in front of your property, to recognized arboriculture standards or under an ISA certified arborist. It has to clear 8 feet over the sidewalk, 12 feet over the street and 14 feet over an arterial. Topping is prohibited, and removing 20 percent or more of the crown or roots is treated as removal, which needs a permit.
Your own trees over the sidewalk or street. City code also asks owners to keep private trees and shrubs at least 8 feet above sidewalks and 10 feet above the roadway.
Protected trees. On significant, grove, landscape and mitigation trees, the development code treats removing more than 10 percent of the canopy as major pruning that needs city approval. We check before the work is booked.
Arborvitae and hedges
Half the fences in Beaverton have an arborvitae hedge in front of them, and most were planted as a row of small shrubs that nobody expected to reach twenty feet. Three things are worth knowing before you have one cut.
- It won't regrow from brown wood. Arborvitae only sprouts from green growth. Shear into the bare interior and the hole is permanent. Height comes down a little each year, not all at once.
- Keep the top narrower than the base. A hedge cut wider at the top shades its own lower branches, which thin out and die.
- Ice splays them open. Multi-stemmed arborvitae peel apart under ice and rarely close up again. Keeping the height down, and tying the stems of the tallest ones, is what saves them.
Laurel and photinia are more forgiving and can be cut back hard in late winter. Whatever the hedge is, we haul the clippings.
Related services and guides
Tree trimming questions
When is the best time to prune trees in Beaverton?
Most structural tree pruning is easiest from December to February, when the tree is dormant and the branch structure is visible. Cherries and plums are better pruned in the dry summer. Dead, broken and hazardous limbs can come out in any month.
How often should trees be pruned?
Young trees benefit from a light structural prune every two or three years. Mature trees usually need deadwood and clearance work every three to five. Fast growers such as willow and cottonwood need it more often, and a healthy mature fir may need almost nothing.
Is topping a tree ever OK?
No. Topping leaves large wounds that decay, and the tree answers with fast, weakly attached sprouts that are more dangerous than what was cut off. Beaverton bans topping street trees. If a tree is too tall for its spot, reduction cuts or removal are the honest options.
Can I prune my own street tree in Beaverton?
You are responsible for maintaining it, and city code requires the work to follow recognized arboriculture standards. Cutting 20 percent or more of the crown or roots counts as removal and needs a permit. Small clearance cuts from the ground are fine. Leave the rest to a crew.
Do you trim hedges and arborvitae?
Yes. Arborvitae, laurel, photinia and boxwood hedges are part of most pruning visits. Arborvitae can be sheared and lowered a little each year, but it won't regrow from bare brown wood, so a hedge that is far too tall can't simply be cut in half.
Will thinning my fir make it safer in wind?
Removing dead and broken limbs and shortening overextended ones helps. Stripping out the inner branches, sometimes sold as wind-sail thinning, does not. It shifts weight to the branch tips and removes the side branches that damp a tree's sway.
Request an estimate
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