| Key Takeaways |
|---|
| • Purpose: Pruning improves plant health and structure, while trimming maintains shape and appearance. • Timing: Prune during dormancy and trim during the active growing season, and never do both at the same time. • Safety: For trees over 15 feet or near power lines, hire a certified arborist. |
Pruning and trimming are often used interchangeably, but they’re not the same thing. Pruning removes specific branches to improve plant health and structure; trimming cuts back overgrowth to maintain shape and appearance.
The difference matters. Using the wrong technique, or doing both at the same time, can stress or damage your plants.
For trees and shrubs that need professional care, Lawn Love connects you with local tree trimming and pruning pros who can handle the job safely.
How are pruning and trimming different?
Trimming and pruning both involve removing branches or stems, but they serve very different purposes. Pruning improves structure, while trimming manages appearance. If both are needed, prune first and wait until later in the season to trim.
“The most common mistake I see is homeowners treating a tree like a hedge, shaping the outside while ignoring serious structural problems underneath,” says Cameron Miller, founder of Spartan Tree and Landscape, from Stanley, North Carolina. “Crossing branches, weak unions, deadwood: none of that gets addressed with a cosmetic trim.”
He says homeowners often think about looks and not the health of the tree.
“The worst offender is topping. People want a shorter tree, so they hack the top off. What they get is decay, stress response, and regrowth that’s weaker and more dangerous than what they started with,” Miller says.
| Aspect | Pruning | Trimming |
| Primary goal | Plant health and structure | Appearance and size control |
| What’s removed | Dead, diseased, damaged, crossing branches | Overgrowth, straggly ends |
| Timing | Dormant season (late fall or early spring) | Growing season, or as needed |
| Tools | Pruners, loppers, pruning saws | Hedge shears, pruning shears |
| Frequency | Every 4 to 5 years for established trees | As needed |
Read more: How to Cut Down a Tree Safely
What is pruning?
Pruning is primarily done to promote long-term health and structural integrity. It involves selectively removing branches to encourage new growth, eliminate damaged or diseased branches, and improve airflow through the center of the plant.
Thinning the canopy also increases air circulation, which can help prevent fungal disease such as powdery mildew.
Technique
Each cut is strategic and targeted, sometimes removing entire branches, sometimes thinning crowded areas, or reshaping the plant’s structure. Pruning requires hand pruners, loppers, or saws to make strategic, deep cuts.
The 3 core methods serve distinct purposes and are covered in depth in our pruning guide:
Canopy thinning: Cut select inner branches at their base to improve air circulation and sunlight penetration.
Canopy raising: Create space underneath the tree by sawing off the bottom limbs just outside the branch collar.
Canopy cleaning: Protect tree health by pruning dead, diseased, or broken branches all the way to healthy wood.
Pro tip: When pruning, your main goal is to identify and fix structural defects. Miller advises looking for “branches crossing or grinding against each other, a canopy so dense you can’t see daylight through it, and cracks at branch attachment points.”
He notes that the biggest red flag is split trunks, where the trunk splits into a tight V-shape rather than a strong U. Miller warns, “That’s a failure point waiting for a storm. If you see bare, barkless limbs mixed into a live canopy, that’s not a cosmetic issue, that’s a hazard.”
Warning: For trees over 15 feet or with branches near power lines, hire a certified arborist.
Read more:
Timing
Prune most trees and shrubs during dormancy in late fall after leaves drop or early spring before new growth begins.
According to the University of Illinois Extension, dormant pruning minimizes plant stress and reduces disease transmission. Two exceptions exist for flowering plants:
Spring-flowering shrubs (azaleas, forsythia, lilac, which bloom before mid-June): prune right after flowering
Summer-flowering shrubs (crape myrtles, butterfly bush, which bloom after mid-June): prune in late winter or early spring before new buds form
Read more: How to Take Care of Trees During a Drought
What is trimming?
Trimming keeps trees and shrubs looking neat and manicured. It can remove dead or damaged foliage to freshen the plant’s look, but it doesn’t address the structural or health problems that pruning fixes. Think of it as cosmetic maintenance, not corrective care.
Technique
Unlike pruning’s deep, structural cuts, trimming uses hedge shears and power trimmers to shape a plant’s exterior, controlling overgrowth and maintaining an attractive landscape appearance.
Shearing: Sweep hedge trimmers evenly across the exterior foliage to cut back overgrowth and maintain neatness.
Shaping: Clip outermost twigs with hand shears to mold the plant into specific aesthetic geometric designs.
Edging: Trim along the plant’s outer borders using shears to create crisp, defined lines against walkways.
Timing
Trimming is usually done during the growing season to encourage bushier growth. For some species, avoid heavy trimming in late summer or fall so new growth can harden before winter.
Read more: How to Trim Tall and Overgrown Bushes
When to prune and trim
Proper timing ensures your plants recover quickly and stay healthy throughout the year.
For most deciduous trees, the ideal window runs from late fall through very early spring, the best pruning time because the structure is visible and pests are dormant.
“Every leaf on a tree is a solar panel,” Miller notes. “When you combine heavy structural cuts with cosmetic trimming in one session, you are ripping out the power grid all at once.
“The tree panics. It either throws out a flush of weak, poorly attached growth called watersprouts, or it just does not have the reserves to bounce back,” Miller explains.
You must prioritize the structural work and let the tree recover before worrying about shape.
Note: Never trim and prune your trees or shrubs at the exact same time. If both are needed, prune first, then wait until later in the growing season, or the following year, to trim.
| Plant type | Pruning timing | Examples |
| Non-flowering trees and shrubs | Late fall to early spring | Oak, maple, ash |
| Spring flowering shrubs | Immediately after flowering | Azaleas, forsythia, lilac |
| Summer flowering shrubs | Late winter or early spring | Crape myrtles, butterfly bush |
Read more:
Tools for pruning and trimming
A quick walk down the aisle at a home improvement store, and you’ll think you need an arsenal of hand tools to take care of your trees and shrubs. Thankfully, though, you don’t need specialized cutting tools. You only need a couple of tools to be successful.
Pruners (pruning shears): For cutting small-diameter branches up to 1.5 inches. Available in bypass (scissor-like) and anvil (striking a flat metal base) types.
Lopping shears: Feature long handles for leverage to cut through thick branches greater than 1.75 inches in diameter.
Garden shears (hedge shears): Long, straight blades used to trim hedges and shrubs evenly. They aren’t generally used for structural pruning.
Pruning saws: Used to remove branches larger than 2 or 3 inches in diameter.
Pro tip: Regardless of the type of tool you’re using, always make sure it’s clean, and the cutting surface is sharp. Wear appropriate safety gear and always work carefully.
Read more: Must-Have Pruning Tools for Trimming Bushes, Trees, and Plants
FAQs
No. Pruning sealers trap moisture inside the wound, leading to rot and disease. Let the tree heal naturally, which is what trees have evolved to do.
Yes. “There’s a reason we follow the one-third rule. The root system is built to support a full canopy,” Miller says. Strip too much away and the tree goes into survival mode, sending out watersprouts that are all weakly attached and actually making the tree less safe than before. As a rule, avoid removing more than one-third of the crown in a single year.
Look for the four Ds: dead, damaged, diseased, or dangerous (crossing, rubbing, or growing toward structures or power lines). Any branch that checks one of those boxes is a pruning candidate.
When to hire a tree service
Getting pruning and trimming right takes practice, the right tools, and time you may not have.
Hiring a pro is not free, but it may be worth it: professional tree trimming costs $412 to $612 per tree, depending on the tree’s size and access.
If you’d rather not take on this DIY task or you’re dealing with branches growing into overhead power lines, Lawn Love can connect you with a local landscaper or bush trimming service. You can stand safely on the ground and allow a Lawn Love pro to prune your trees and shrubs.
Read more: How to Landscape with Shrubs
Main Image: Side by side image of pruning a branch and trimming a shrub in lawn. Image Credits:
Pruning: Rostislav Sedlacek / Adobe Stock.
Trimming: Tomasz Zajda / Adobe Stock
Related Posts:
