What to Prune When - Part 2

Hydrangeas

Most hydrangea types -- pink, blue, or white mopheads and lacecaps, or oakleaf forms -- bloom on old wood. Prune these types of hydrangeas before midsummer. If you prune them in winter or early spring, you'll be removing flower buds.

With newer reblooming types, such as the Endless Summer Series or Let's Dance Series, which bloom on new growth as well as old wood, timing of pruning is less critical. Even if you cut off some of the flower buds by pruning the old stems, the plant will bloom on the new growth.

White-flowered paniculata (such as the varieties 'PeeGee' and 'Limelight') and arborescens (including 'Annabelle') types flower on new wood, so they can be pruned any time other than just before they bloom.

Shrubs Without Showy Blooms

Cut back shrubs grown primarily for their foliage, such as barberry and burning bush, almost anytime except in late autumn. New growth that starts after late-season pruning won't harden off properly before winter. If you want to do major pruning, it's best to cut the shrub back when it is dormant in winter.

 Clipped Hedges

Shrubs such as boxwood and privet are often sheared to form a hedge. To maintain a solid wall of green, shear the new growth frequently during the early part of the growing season. Keep the top narrower than the base so that the upper branches don't shade the lower ones. Stop shearing the hedge approximately six weeks before your area's average first frost.

Test Garden Tip: If you're growing a privacy hedge, reduce the amount of pruning maintenance needed by selecting shrubs that grow only as tall and wide as necessary to provide screening. Allow them to grow into their natural form, and little, if any, pruning will be required.

Roses

Treat climbers and old garden roses that bloom only once per year the same as other spring-blooming shrubs: Pruning after they finish blooming.

Repeat bloomers, including hybrid teas, floribundas, grandifloras, miniatures, and modern shrub roses are pruned mostly to shape the plant or to remove winter-damaged canes. If they become overgrown, cut them back in early spring.

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