Fall pruning in Georgia: what to cut now, what to leave alone

Fall feels like the natural time to tidy the yard. The mower's slowing down, the light's better, and everything looks a little shaggy. But pruning at the wrong time can cost you a season of flowers or push tender new growth right into the first frost. Here's the short version for north Georgia.

The rule that covers most cases

Prune spring bloomers right after they flower. Prune summer bloomers in late winter. Leave the rest until dormancy.

Spring-flowering shrubs — azalea, forsythia, loropetalum, oakleaf hydrangea, spirea — set their flower buds the previous year. Cut them in fall and you're cutting off spring. Their pruning window was back in May, right after the blooms faded.

Summer bloomers — crape myrtle, panicle hydrangea, butterfly bush, roses — bloom on new growth. They get pruned in late winter, February into early March here, while they're still dormant.

What fall pruning is actually good for

You can do this any time, including now:

• Dead, damaged, or diseased wood. Always fair game. Cut back to healthy tissue.
• Crossing or rubbing branches on trees and large shrubs — remove the weaker of the two.
• Suckers and water sprouts at the base of trees and coming straight up off limbs.
• A branch that's a hazard — hanging over the driveway, into a walkway, touching the roof.
• Light shaping of evergreen hedges (boxwood, holly, cleyera) to knock off the ragged flush of late-summer growth. Keep it light. Hard cuts on evergreens in fall don't have time to recover before cold.

What to leave alone until true dormancy

• Oak trees. In Georgia, avoid pruning oaks between roughly April and October — fresh cuts in the warm months attract the beetles that spread oak wilt. November through February is the safe window.
• Maples, birches, dogwoods, elms. These "bleed" sap heavily if cut in late winter. Prune them in summer or very early fall instead — a rare case where now is actually better than February.
• Anything you want to bloom in spring. Worth repeating.
• Big structural cuts on any tree. Removing a limb more than a couple inches thick, or anything that changes the tree's shape, is a job for a certified arborist and usually a job for winter.

A note on crape myrtles

You'll see them cut down to knuckled stubs every February. That's not pruning, and it doesn't make them bloom better — it makes them send up whippy growth that flops under the flowers. If a crape myrtle needs to be that much smaller, it was the wrong plant for the spot. Thin it instead: take out crossing branches and anything smaller than a pencil, and let it keep its natural vase shape.

When to call someone

Ground-level shrub work with hand tools is a fine weekend job. Anything that needs a ladder and a chainsaw, anything near a power line, and any real cut into a mature tree — that's when you want a pro with insurance and an arborist on the crew, not a Saturday and good intentions.