Home gardeners have the flexibility to trim away damaged stems and infected branches throughout the year, yet significant summer pruning is not always beneficial. While certain species can tolerate the shears in the warmer months, cutting the wrong plants can eliminate flower buds, curtail blooming, and increase susceptibility to pests and diseases. To ensure robust and abundant flowering in ornamentals, it’s advisable to steer clear of pruning these ten plants during the summer.
Renowned for their summer blossoms and sweet scent, abelias are both bee and hummingbird magnets, often featured in pollinator-friendly habitats or as ornamental showpieces. However, it’s recommended to refrain from summer pruning of abelias. These shrubs flower on the current season’s growth, and cutting them at the wrong time can deprive pollinators and diminish their value.
Crape myrtles, being summer bloomers, are best left unpruned until they enter their winter dormancy. Summer trimming can delay their flowering and make them more prone to diseases. That said, removing spent flowers to control seed dispersal is permissible.
Dogwood (Cornus florida) is somewhat tolerant of summer pruning, yet it’s still preferable to wait until winter dormancy. Pruning during the active season can lead to unsightly sap bleeding and increased pest susceptibility.
Potentillas, or cinquefoils, periodically require grooming, but summer is not the right season. These plants are in full bloom, and pruning now could reduce their floral display and stress them to the point of affecting the following year’s flowers. Opt to prune them during their winter dormancy, cutting the thickest stems to the ground as they are less likely to rebloom.
Smoke bush, with its mist-like flowers gracing the garden from late spring to early fall, is best pruned in early spring. Summer pruning can diminish its flowers and stress the plant, increasing the risk of diseases. Fall pruning should also be avoided to prevent autumn leafing and frost damage to tender stems.
Oleanders, despite blooming on new wood, should not be pruned in the summer. Their peak flowering period extends from summer to fall, and pruning then can disrupt their display. For the healthiest oleanders, wait until the late winter to early spring dormancy period to prune, focusing on cutting stems back to a leaf node to promote branching.
Lilac bushes are better off not being pruned during the summer or fall. They bloom on old wood, and summer pruning can remove the buds needed for the following spring’s flowers, leaving you with a bloomless plant.
Similar to lilacs, forsythias should only be trimmed right after their spring flowering. Summer or fall pruning can eliminate buds, reducing the following year’s flowers. While damaged branches can be cut at any time, reshaping in the summer is not recommended.
Daphne plants grow slowly and infrequently require pruning. If necessary, do so right after flowering, as they also bloom on old wood. Summer pruning can remove vital flower buds and limit their blooming.
Rhododendrons, which flower on old wood, should have their pruning shears put away until just after they finish blooming. Cutting at other times risks reducing their flower buds and exposing them to tender new growth that can attract aphids and other pests.
