Some perennials should be left undisturbed in the fall. Evergreen perennials like coral bells (left) and hydrangeas that bloom on old wood (right) should not be pruned. These plants also add interest to the winter landscape.
October 18, 2025
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October 18, 2025 1 a.m.
Fall perennial care: What to prune and divide now
As temperatures cool down, the garden seems to come alive again, especially with the recent rains. Dahlias, zinnias, and phlox all appear to deepen in their colors, providing one last burst of beauty before frost arrives. Once the first frost arrives, typically by mid-to-late October, it’s time to prune many perennials and divide them if needed to promote healthy blooms in the spring.