Northamptonshire,
United Kingdom 
what plants can be cut back in september
20 Sep, 2010
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Certain perennials that have finished flowering, such as Campanulas, Lysimachias or Achilleas, you can cut them back. There are a few like Penstemons which need the top growth as protection in the winter though. Some plants also have attractive seeedheads that you may wish to leave. Don't be too tidy - insects like hiding places, and birds like seeds.
20 Sep, 2010