Is now an okay time (early Spring, gardening zone 7B) to go ahead and prune my Dusty Miller plants?

They are gorgeous and I'm glad they survived the winter, but they didn't just survive... they're getting HUGE! They line my mailbox flowerbed and I had a Tulip bloom in the middle that could barely even be seen! I don't want to get rid of them... just trim them down a little so that the colorful can be enjoyed and seen too.
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