As gardeners begin their fall cleanup routines, experts advise exercising caution to avoid over-pruning, which can negatively impact plant health and future blossoms. While this season is typically associated with tidying gardens, leaving certain perennials and shrubs intact through the winter months can provide significant benefits.

Some perennials are particularly valuable when left standing, as their seed heads supply food for nonmigratory birds and offer overwintering shelter for pollinators and beneficial insects. Plants in this category include allium, aster, big-leaf lupine, black-eyed Susan, chocolate flower, coneflower, goldenrod, milkweed, rattlesnake master, sneezeweed, and trumpet vine, among others.

When it comes to shrubs, timing is crucial. Many spring-blooming shrubs develop their flowers on last year’s growth, known as “old wood.” Pruning these plants during the fall risks removing buds that would otherwise bloom in the upcoming spring. Shrubs such as azaleas, rhododendrons, forsythia, and hydrangeas fall into this group, and gardeners are advised to delay trimming them until after they have flowered.

Conversely, certain plants do benefit from end-of-season pruning to promote health and prevent disease, although the specific recommendations vary by species. Gardeners should identify each plant type in their landscapes and adjust their care accordingly.

Understanding these nuances in fall garden maintenance can support robust bloom cycles and create a more sustainable habitat for wildlife. Experts emphasize that a carefully planned cleanup, rather than a wholesale pruning, helps maintain garden vitality through winter and into spring.