As it's only a low growing (6inch) rockery perennial, I'd feel inclined to leave it, but if you want to tidy it up for appearance sake, then a light trim at the end of the flowering season to the stems should do no harm.
As it's only a low growing (6inch) rockery perennial, I'd feel inclined to leave it, but if you want to tidy it up for appearance sake, then a light trim at the end of the flowering season to the stems should do no harm.
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