You can cut it back just to tidy it up, but re-flowering depends on conditions and soil type. Sometimes, the plants are still flowering in the autumn, especially in semi shaded areas.
I rarely cut any plants, I pull the spent flowers off, so with this campanula I comb it with my fingers, its flowers come off easily and the green stays looking nice.
Gardening on the wild, windy west side of Dartmoor.
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