Does Valerian respond to the 'chelsea chop'
Has anyone tried the 'Chelsea chop' on Valerian? I have a clump of what I was sold as white Valerian (Centranthus Alba). Its a lovely plant, with delicate feathery leaves and umbels of white flowers. My books say Valerian should grow to about a metre tall, but for the last two years this plant has put out 3-4 flower stems exceding 2m in height and towering over my weeping cherry tree which looks odd. So I wonder if I cut it back in May before the flowers develop will it respond by producing more, shorter flowering stems or will I just stop it flowering altogether?