cutting back sweet allyssum

Hello fellow gardeners...I'm new here and have following question: should sweet allyssum be cut back when it starts to look scraggly? Or is it time to pull it out and replace with new plants?

Garner, NC(Zone 7b)

who, I usually cut it back whenever it begins to set seed. I don't know your zone, but it may rejuvinate it. I also find that if I leave the area unmulched at the end of the season, it will reseed. I put in white alyssum this year, but have little purple ones coming in around it.
Bev

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