How to Prune Plants and Shrubs

Use the right tools

Sharp, clean tools make pruning easier and healthier for the plant. Hand pruners handle small stems, loppers cut thicker branches, and a pruning saw takes care of large limbs. Clean the blades between plants with rubbing alcohol to avoid spreading disease, and keep them sharp — a clean cut heals far faster than a crushed, ragged one.

Start with the three D’s

Before shaping anything, remove the three D’s: dead, damaged, and diseased wood. These cuts are safe to make any time of year, and they immediately improve the plant’s health. Then look for branches that cross or rub against each other, and remove the weaker one to open up the center to light and air.

Make the cut correctly

Cut just above an outward-facing bud, at a slight angle that sheds water away from the bud. Leaving a long stub invites rot, while cutting too close damages the bud. For larger branches, cut back to a side branch or the main trunk rather than leaving a stub, so the plant can heal cleanly.

Time it right

When you prune matters. Shrubs that bloom in spring, like lilac and forsythia, set their flower buds the previous year, so prune them right after they finish flowering. Summer-blooming shrubs, like butterfly bush and many hydrangeas, flower on new growth, so prune them in late winter or early spring. When in doubt, prune right after the plant blooms.

Avoid common mistakes

• Don't shear everything into tight balls — it weakens plants and reduces blooms.
• Don't prune in late summer, which can stimulate tender growth that winter kills.
• Don't top trees — removing the top of a tree permanently damages its structure.

Prune different shrubs differently

Different shrubs have different pruning needs. Spring bloomers like lilac and forsythia flower on last year’s wood, so prune them right after they bloom. Summer bloomers like butterfly bush and rose-of-Sharon flower on new growth, so prune them in late winter. Evergreens mostly need little pruning beyond removing dead or damaged branches.

If you're unsure of a shrub’s type, a safe rule is to prune immediately after it finishes flowering. That timing preserves this year’s blooms and gives the plant the whole season to set next year’s buds.

Prune with a purpose

Before you make any cut, ask yourself why. You might be removing dead wood, opening the plant to airflow, encouraging more flowers, or shaping an overgrown shrub. Each goal suggests a different cut, and knowing the reason keeps you from pruning for the sake of it.

A good rule is to cut with intention and stop when the goal is met. Most plants need far less pruning than people think, and a light, thoughtful hand is almost always better than an aggressive one.

Prune young plants for shape

Light, early pruning shapes a plant while it's still easy to manage. Removing a few poorly placed branches on a young shrub guides its future form far better than trying to correct a mature, overgrown plant later. A little attention in the first years pays off for the life of the plant.

Clean up after pruning

After pruning, clear away the cuttings, especially anything diseased, and dispose of them in the trash rather than leaving them under the plant. Debris can harbor pests and disease, so a quick cleanup keeps the benefits of pruning from being undone.