Reducing Bowles Mauve size
Hi there. I have a large clump of Bowles Mauve Wallflower (originally two plants) in my border that seems to be doing well - a little *too* well, really - as it's grown into a patch that's getting a tad big for its boots! When is the best time to perhaps splice the clump in half, please? (I won't throw away what is surplus to requirements; I shall give it to my stepdad to plant in his border). Many thanks in advance.