In Spring, use your hand like a comb and the dead leaves will easily come away. If you want it to look tidier, just scoop all the leaves up into a vertical position and trim the top couple of inches off with a sharp pair of secateurs. When you release the leaves you will have a tidier dome shape which will then soften and look more natural as the plant grows. Carex looks like a grass but it is actually a sedge. It is evergreen (or bronze in this case!) and, unlike most deciduous grasses, shouldn't be trimmed to the ground.
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border