Tree trimming & pruning — a homeowner’s guide

Why you don’t top trees

“Topping” means cutting the main stem or large branches back to stubs — often done to reduce height quickly. It looks decisive. It is almost always a bad idea.

• It starves the tree. Leaves make the food. Removing a huge share of the canopy shocks the tree and can start a long decline.
• Weak sprouts race upward. The tree responds with fast, poorly attached shoots (often called water sprouts). They grow tall again — and break more easily in wind or ice.
• Decay moves in. Large stubs rarely seal well. Open wounds invite insects, fungus, and rot into the trunk.
• You pay twice. A topped tree usually needs more corrective work later — or early removal — instead of one careful pruning job.

If a tree is simply too large for the space, reduction pruning (selective cuts back to healthy laterals) or removal may be safer options. We can walk you through that on a free estimate — no pressure either way.

Correct pruning cuts

Trees don’t “heal” like skin. They seal over wounds. Clean cuts at the right place help that sealing.

The branch collar

Where a branch meets the trunk (or a larger limb), you’ll often see a slight ridge or swelling — the branch collar. A good cut removes the branch just outside that collar, without leaving a long stub and without cutting flush into the trunk.

Three-cut method for larger limbs

1. Undercut a short distance out from the collar — prevents bark from tearing down the trunk.
2. Top cut farther out so the limb falls cleanly.
3. Final cut just outside the collar to finish the job.

What we aim for

• Remove dead, damaged, or crossing branches first
• Thin for light and air without stripping the interior
• Keep the tree’s natural shape — don’t carve a flat “hat”
• Avoid removing more than about a quarter of the live canopy in one season (species and health matter; we’ll advise on site)

Apical dominance — in plain English

Trees grow from buds. The tip of a shoot (the apex) usually produces hormones that tell lower buds to stay quieter. That “top tip is boss” effect is called apical dominance.

Why it matters when you prune:

• Cut that tip off, and lower buds often wake up and push many new shoots.
• That’s why topping creates a broom of weak sprouts instead of one strong leader.
• Thoughtful cuts redirect growth to a healthy side branch that can take over — keeping structure strong instead of chaotic.

You don’t need to memorize the science. Just remember: where you cut changes how the tree grows next year. That’s a big part of what we’re watching for when we prune.

Common DIY mistakes

Homeowners who care about their yards sometimes still get steered wrong by myths or shortcuts:

• Topping “to control size.” It doesn’t — it creates a denser, weaker mess.
• Lion’s tailing. Stripping inner branches and leaving foliage only at the tips makes limbs whip and break in storms.
• Flush cuts. Cutting into the collar removes the tree’s natural sealing zone.
• Leaving long stubs. Stubs die back and open a door for decay.
• Painting every wound. Wound paint usually isn’t needed on healthy trees and can trap moisture; we rarely recommend it.
• Climbing with a chainsaw on a ladder. Falls and kickback are real — even “small” jobs put people in hospitals every year.
• Pruning at the wrong time for the species. Some trees bleed heavily or invite pests if cut at the wrong season; ask before you cut.

When to call a pro

Consider calling Aspen Tree Service (or any qualified local arborist/tree service) when:

• Work is above comfortable ladder height or near power lines
• Branches hang over the roof, driveway, or neighbor’s property
• You see cracks, cavities, mushrooms at the base, or sudden lean
• A previous topping job needs correcting
• You’re not sure whether to prune or remove
• Storm damage left hung-up or split limbs

We’ll look at the tree, explain options in everyday language, and give you a free estimate. If a light prune is enough, we’ll say so. If removal is safer, we’ll say that too — we trim the tree, not the customer.