KEY POINTS ON CUTTING BACK
Restore order and tidiness, and reduce the chance of diseases and pests spreading, by chopping down most dead perennial stems to the ground.
Leave the way for fresh growth to make its way through in spring, unencumbered by old, wet and saggy stems.
Dying stems, battered about by wind and rain, may damage the crowns of plants, so tuck them away from the weather by cutting back.
Leave penstemons and hydrangeas be until spring – the stems of the plant can protect these frost-prone perennials from any freezing temperatures.
Leave anything that’s sheltered and sturdy and looks healthy to stay put until spring. How to Using sharp secateurs, shears or a knife, cut close to the crown. Compost everything except obviously diseased plant material, which should be disposed of or burnt. If new foliage or stem growth is already showing, cut only to above this. Mulch well around every plant you cut down.
Remember Leave evergreen perennials until spring and summer for a trim and a tidy up of dead foliage.