There are loads of hardy perennials that don't need much attention, apart from some deadheading and cutting down old foliage. Most lose their leaves in winter and grow back in spring. You can't go wrong with hardy geraniums, but they aren't all evergreen. Epimediums and Liriope are evergreen but prefer some shade. Some hardy evergreens like erysimum Bowles Mauve and some Agapanthus aren't hardy in very cold wet winters.
You could try mixing with some evergreen flowering shrubs.
I would Google perennials and read about them or buy a good book such as the one by Clare Austin.
Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
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You could try mixing with some evergreen flowering shrubs.
I would Google perennials and read about them or buy a good book such as the one by Clare Austin.