Most pruning mistakes are not about technique. They are about doing the right cut at the wrong time of year.
The rule that covers most shrubs
Shrubs that flower in spring set their buds the previous summer. Prune them just after they finish flowering.
Shrubs that flower in summer set buds on the current season's growth. Prune those in late winter before growth starts.
Pruning a spring bloomer in winter removes the flowers you were waiting for — this is why azaleas sometimes fail to bloom after a tidy-up.
Hydrangeas are the confusing case: some types bloom on old wood, some on new, and some on both. Identify yours before cutting.
Rough timing through the year
Late winter: summer bloomers, overgrown deciduous shrubs, structural work while the framework is visible.
After bloom in spring: azaleas, forsythia, spring viburnum, loropetalum and other early flowerers.
Early summer: light shaping of evergreens and hedge maintenance.
Late summer and early fall: avoid hard pruning. New growth pushed late may not harden before frost.
Any time: dead, damaged, diseased or crossing branches.
Shearing versus proper pruning
Shearing cuts everything at the same plane, producing a dense outer shell and a dead, twiggy interior.
Selective pruning — removing individual branches back to a joint — keeps the plant's natural form and lets light inside.
Formal hedges are the legitimate use for shearing, and they must be cut slightly wider at the base so the bottom keeps its light.
Repeated shearing is the reason so many foundation plantings become green boxes pressed against the house.
Renovation and knowing when to stop
Badly overgrown shrubs can sometimes be renovated hard in late winter, and many broadleaf evergreens respond well.
Most needled evergreens will not regrow from bare old wood — cut into it and it stays bare.
Renovation can be staged over two or three years, removing a portion of the oldest stems each winter.
Sometimes removal and replanting at correct spacing is the better answer than years of renovation.
Southern Style Turf & Design renovates and replants overgrown beds across the Lake Norman area, including plants that outgrew their space years ago.
Frequently asked questions
When should I prune azaleas?
Right after they finish flowering in spring. Pruning later removes next year's buds.
When should I prune hydrangeas?
It depends on the type. Old-wood bloomers are pruned after flowering; new-wood types can be cut in late winter. Identify yours first.
Is it bad to shear shrubs?
For formal hedges it is appropriate. For everything else, selective pruning keeps a healthier, better-looking plant.
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