5 Pruning Mistakes That Can Damage Your Trees

CUTTING TOO MUCH OFF AT ONCE

One of the most common pruning mistakes is simply removing too much.

Leaves are how a tree produces energy. Removing a large proportion of the canopy in one go can place the tree under unnecessary stress and may trigger a flush of vigorous new growth.

That new growth isn’t necessarily an improvement. In some situations it can be weakly attached and create more maintenance problems in the future.

Good pruning is usually selective. The goal should be to solve a particular problem while retaining as much healthy, well-positioned growth as possible.

Don’t start with the question, “How much can I remove?” Start with, “Why am I making this cut?”

TOPPING THE TREE

Topping usually involves cutting major branches or stems back to stubs simply to reduce the overall height or size of a tree.

It can look like a quick solution when a tree has become too large, but it often creates a new set of problems.

Heavy topping can encourage dense, fast regrowth around the cuts. That growth may be poorly attached and can eventually require repeated pruning.

It also removes much of the tree’s natural canopy structure and can leave large pruning wounds.

If a mature tree has genuinely outgrown its location, it is better to assess the whole situation rather than repeatedly cutting the top off it.

Sometimes appropriate tree maintenance can manage the problem. In other situations, tree removal may be the more sensible long-term option.

MAKING POOR CUTS

Where you cut a branch matters.

Leaving a long stub isn’t ideal, but cutting too tightly into the trunk or parent branch can also damage tissue that helps the tree respond to the wound.

A good pruning cut removes the branch without unnecessarily damaging the surrounding structure.

This becomes increasingly important as branch size increases. A small mistake on a tiny garden branch is one thing. A poor cut through a large structural limb is something very different.

Large branches can also tear bark as they fall if they are cut incorrectly, creating a much larger wound than necessary.

PRUNING WITHOUT KNOWING WHY

Every cut should have a purpose.

Pruning simply because a branch “looks wrong” or because the tree seems too bushy can easily lead to removing useful, healthy growth.

Common reasons for pruning include:

• Removing dead or damaged branches.
• Improving clearance around buildings or accessways.
• Removing crossing or rubbing branches.
• Improving the structure of younger trees.
• Managing poorly positioned growth.
• Addressing a specific safety concern.

If you can’t explain what problem a cut is solving, it may be worth leaving the branch where it is.

TAKING ON A JOB THAT’S TOO BIG

Perhaps the biggest mistake is treating every pruning job like ordinary garden maintenance.

Once a branch is large, high off the ground or positioned over something important, the risks change quickly.

Stop and get professional help when the work involves:

• Ladders or climbing.
• Chainsaws at height.
• Large or heavy branches.
• Branches above roofs, vehicles or accessways.
• Trees close to powerlines.
• Storm-damaged or unstable limbs.
• A tree that appears structurally compromised.

Cutting a branch is only part of the job. You also need to know where that branch is going to move, swing and land once the cut is made.

If you’re unsure whether you can control the branch, don’t cut it.

GOOD PRUNING SHOULD SOLVE A PROBLEM

The best pruning often looks less dramatic than people expect.

It is about making the right cuts in the right places while retaining the tree’s natural structure wherever possible.

If you’re dealing with a few small branches from ground level, keep the work simple and considered.

If the tree needs significant reduction, contains large deadwood, is close to structures or you simply aren’t sure what should come off, getting an arborist to assess it first can save a lot of unnecessary cutting.

And if you haven’t already, have a look at our guide to when to prune your trees before getting started.