Pruning Guide
Pruning is one of the best things you can do for your shrubs. Regular pruning maintains the shrubs’ size and prevents breakage during the winter months by managing the structure of the plant. It even creates more flowers as the shrub redirects its energy into flower production rather than overgrowth.
The chart that follows provides our timing recommendations for pruning some of the most popular shrubs in our area. The “Flower Buds” column notes whether the buds form on new or old growth and the “comments” column incudes some of our gardeners’ tips to prune your shrub of choice.
For reference, here are the pruning techniques we recommend:
- Heading: Trimming long, unbranched stems by cutting above a healthy bud. This encourages lower branches to develop.
- Rejuvenation: Cutting back all of the stems to within an inch of the ground during dormancy. Come spring, the plants will product new shoots from the base.
- Thinning: Removing selected shoots or the main stem to open up the middle of the plant to more sunlight. This helps to maintain the natural form, keeps the interior branches healthy and encourages new growth.
- Shearing: Trimming the plant around the outside to restore the structure in the landscape setting.
Plant Name | Best Time | Flower Buds | Pruning Method | Comments |
---|---|---|---|---|
Abelia Abelia x grandiflora | February-March | New growth | Thinning, shearing | Shape as needed in growing season. Old plants can be rejuvenated. |
Andromeda Pieris japonica | May-June | Old growth | Thinning, heading | Prune after flowering, requires very little pruning. |
Aucuba Aucuba japonica | March-April | New growth | Heading, shearing | Can slowly rejuvenate old, leggy plants. |
Azalea Rhododendron spp. | May-June | Old growth | Thinning | Can rejuvenate overgrown plants. Prune after flowering. |
Barberry Berberis spp. | March-May | New growth | Shearing | Shape as needed in growing season. |
Bayberry M. pensylvanica | May-June | Old growth | Thinning, heading | Prune to maintain natural shape |
Beautyberry Callicarpa spp. | January-February | New growth | Thinning, heading | Can rejuvenate old, leggy plants. |
Boxwood Buxus spp. | February-March | N/A | Thinning, heading | Annual thinning improves health and density. Can occasionally shear vigorous varieties. |
Burning Bush Euonymus alatus | March-April | New growth | Thinning, shearing | Shape as needed in growing season. |
Butterfly Bush Buddleia spp. | March-April | New growth | Rejuvenation, thinning | Rejuvenate each spring. Deadhead spent flowers to encourage reblooming. |
Camellia Camellia japonica | May-June | Old growth | Thinning, heading | Slow to recover from heavy pruning. |
Camellia Camellia sasanqua | May-June | Old growth | Thinning, heading | Slow to recover from heavy pruning. |
Chaste Tree Vitex agnus-castus | February-March | New growth | Thinning, heading | Old, leggy plants can be rejuvenated. |
Cherry Laurel Prunus laurocerasus | May-June | Old growth | Heading, shearing | Prune just after flowering. Shape as needed in growing season. |
Cotoneaster Cotoneaster spp. | February-March | Old and new growth | Thinning | Remove dead branches and trim irregular growth. Can be shared, but this diminishes natural form. |
Crape Myrtle Laegerstromia hybrids | March-April | New growth | Thinning, heading | Shrub forms can be sheared, but this diminishes natural form. |
Daphne, Winter Daphne odora | April-May | Old growth | Heading | Daphne is a slow growing, compact plant. Little to no pruning necessary. |
Deutzia Deutzia spp. | May-June | Old growth | Shearing, heading | Prune after flowering. |
Dogwood, Red Twig Cornus alba | March | Old growth | Rejuvenation, thinning | Rejuvenation encourages bright, colorful stems. |
Firethorn Pyracantha coccinea | February-March | Old growth | Thinning, heading | Flowers and berries produced on previous year’s “spurs”. Retain as many spurs as possible for berry production. |
Forsythia Forsythia hybrid | April-May | Old growth | Thinning, rejuvenation | Remove old canes annually to keep dense and full. |
Fothergilla, Dwarf Fothergilla gardenii | May-June | Old growth | Thinning, heading | Prune after flowering |
Heavenly Bamboo N. domestica | March-April | New growth | Thinning, heading | Thin a few of the older branches each year on tall varieties to prevent leggy growth. |
Holly Ilex spp. | February-March | Old growth | Shearing, heading | Can rejuvenate overgrown plants. |
Hydrangea, Smooth H. arborescens | January-March | New growth | Heading, rejuvenation | Prune annually to keep dense and full. |
Hydrangea, Big Leaf H. macrophylla | March or after flowering | Old growth | Thinning | Remove dead branches in March, or prune immediately after flowering. |
Hydrangea, Panicle H. paniculata | January-March | New growth | Thinning, heading | Can rejuvenate overgrown plants. |
Hydrangea, Oakleaf | June-July | Old growth | Thinning, heading | Prune after flowering. |
Jasmine, Winter Jasminum nudiflorium | March-April | Old growth | Thinning, shearing | Prune after flowering. |
Juniper Juniperus spp. | February-April | N/A | Shearing, heading | Prune green tips only. Junipers will not regrow from woody stems. |
Kerria Kerria japonica | May-June | Old growth | Thinning, heading | Thin old, leggy stems after flowering. |
Lilac, common Syringa vulgaris | May-June | Old growth | Thinning, heading | Prune after flowering. |
Lilac, Dwarf Korean Syringa meyeri | June-July | Old growth | Thinning, heading | Prune after flowering. |
Loropetalum Loropetalum hybrid | February-March | Old and new growth | Thinning, rejuvenation | Prune in late winter, shape as needed in growing season. |
Mahonia Mahonia spp. | March-April | Old growth | Thinning, rejuvenation | Remove old, leggy stems in early spring. |
Mockorange Philadelphus hybrid | May-June | Old growth | Thinning, heading | Prune old, leggy stems after flowering. |
Mountain Laurel Kalmia latifolia | June-July | Old growth | Thinning, heading | Prune after flowering. Old, leggy plants can be rejuvenated. |
Ninebark Physocarpus opulifolius | May-June | Old growth | Thinning, heading | Prune after flowering. Thin branches and head back outer growth by 1/4-1/3. |
Photinia, Red Tip Photinia x frasier | February-March | New growth | Thinning, shearing | Thin branches in February to March. Shear tips in early summer to maintain red tips. |
Privet Lugustrum spp. | February-March | New growth | Shearing, heading, rejuvenation | Trim as needed through growing season. |
Pussywillow Salix caprea | April-May | Old growth | Thinning, rejuvenation | Prune after flowering. |
Quince, flowering Chaenomeles spp. | May-June | Old growth | Thinning, rejuvenation | Prune after flowering. |
Rose, shrub Rose hybrid | February-March | New growth | Rejuvenation, thinning | Climbing roses use different techniques. Preserve main canes and prune lateral branches to promote flowering. |
Rose-of-Sharon Hibiscus syriacus | January-March | New growth | Thinning, heading | Prune vigorous branches as needed in the growing season. |
Smoke Tree Cotinus coggygria | January-March | Old growth | Thinning, heading | Leggy plants can be rejuvenated. |
Spirea, Bumald Spirea x Bumalda | May-June | New and Old Growth | Thinning, shearing | Deadhead blooms for repeat flowering. |
Spirea, Vanhoutte Spirea x vanhouttei | May-June | Old growth | Shearing, rejuvenation | Prune after flowering. |
Spirea, Japanese Spirea japonica | January-February | New and old growth | Shearing, rejuvenation | Shape as needed through the growing season. |
Sweetshrub Calycanthus floridus | June-July | New and old growth | Thinning, rejuvenation | Thin suckers after flowering. |
Viburnum Viburnum spp. | May-June | Old growth | Thinning, heading | Prune after flowering. |
Virginia Sweetspire Itea virginica | June-July | Old growth | Thinning, heading | Prune after flowering. |
Weigela Wiegela florida | May-June | Old growth | Thinning, heading | Remove old leggy stems and shape as needed. Prune after flowering. |
Winterberry Ilex verticilata | February-March | Old growth | Thinning, heading | Heavy pruning will diminish berry production. Thin out leggy branches. |
Witchhazel Hamemaelis spp. | March | Old growth | Thinning, heading | Remove ‘suckers’ in January. Thin branches after flowering. |