Common Mistakes to Avoid When Trimming Trees and Bushes

“Topping” is one of the most damaging and unfortunately common practices in DIY trimming. This involves cutting off the top of a tree (typically motivated to reduce its height or size quickly). The result? A weakened and unstable tree that’s more vulnerable to pests, disease, and storm damage.

Topping doesn’t just look unnatural; it actually destroys the tree’s structure. The tree will respond by sprouting weak and fast-growing branches that are poorly anchored. In the long-term, this can cost you more in corrective trimming, potential storm cleanup, or even a full tree removal.

Trimming at the Wrong Time of Year

You and I can get a haircut on any day the barber is available, but trees don't enjoy this luxury. Trimming might feel like a good weekend project anytime the weather is nice, but timing is everything. Do it at the wrong time and you risk stressing the plant, stunting growth, or cutting away next season’s blooms.

If you’re not sure when to trim a certain plant or tree, then it’s best to consult a certified arborist. Otherwise, you risk losing an entire season’s worth of flowers or fruit.

Over-Trimming or Under-Trimming

Like with many things in life: it’s all about balance. Trim too much and you weaken the plant’s capacity to photosynthesize and protect itself. Trim too little and you leave behind deadwood, disease, or chaotic growth that can spiral out of control.

For bushes, shearing off the outer edges may seem tidy, but repeated over-trimming causes bare spots and a thin and unhealthy center. Trees need selective and strategic cuts to maintain structural integrity and promote airflow; they don't need a drastic makeover.

The general rule is to never remove more than 25% of a tree’s canopy in a single season. Bushes vary depending on species and condition.

Using the Wrong Tools (or Dirty Tools)

A dull pair of hedge shears or a rusty saw can do more damage than you think. Clean and sharp cuts help wounds heal faster. Ragged or crushed cuts, meanwhile, leave plants vulnerable to disease and decay.

Equally important: dirty tools can transfer bacteria, fungi, or pests from one plant to another. Sanitizing your equipment between cuts is essential, especially when working with diseased limbs.

Ignoring Safety Hazards

It's not just the tree or bush that's at risk during a DIY trimming. Every year, homeowners are injured trying to remove heavy limbs or shape overgrown trees without the proper equipment or training. Even smaller tasks can become risky if you’re dealing with a diseased or unstable tree.

If the tree service requires climbing more than a few feet, or if it's near utilities, then it is always advisable to call in the pros.

When In Doubt, Call the Experts at Driscoll

If you’ve made it this far and are thinking, “This sounds like more than I bargained for,” then you’re not alone. That’s why many Metro Atlanta homeowners rely on professionals like Driscoll Tree Service to get the job done right.

Driscoll is a locally owned and operated tree service company with certified arborists, a uniformed team, and 24/7 emergency service. Whether it’s for shaping ornamental bushes, trimming mature oaks, or handling storm damage, you can call Driscoll and rest assured the job is done right the first time around.