The flowers are almost gone, and the plants are heavy with their seeds, I think! Not looking very attractive, and too dominant in the flower bed...can I cut them back, and if so, how?
Certified GKH Gardening Expert
You can cut back the seed heads and stalks, but it is best not to cut back the leaves until they die on their own at the end of the growing season. The plant needs them to store energy for growing and blooming next year.