I cut mine back when the stems go brown and don't look nice any more. They still all look very decorative so I have left them alone apart from one or two round the edges. The RHS says cut back flowering shoots to the ground in later summer or autumn.
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I cut mine back when the stems go brown and don't look nice any more. They still all look very decorative so I have left them alone apart from one or two round the edges. The RHS says cut back flowering shoots to the ground in later summer or autumn.
Don't agree Verdun, leave them as long as possible. They sometimes last right through the winter and still look good.