A favorite for container gardens and cut-flower beds, panicle and smooth hydrangeas are next on the list of plants ready for a fresh pre-fall trim. "Pruning panicle and smooth hydrangeas in fall ...
If you want to ensure that your garden will grow more abundant fruits and flowers after winter, a few plants need to be trimmed before the end of the month.
Cut close to buds, but not into them, and always above. Early pruning helps establish a shapely shrub with vigorous, balanced growth. Most evergreen shrubs do not need thinning or formative pruning.