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When and how to pinch back mums. If you decide to prune your mums, you can start pinching stems in spring when the plants have reached a height of about 6 inches. To pinch them back, simply grab a stem between your thumb and index finger about 2 to 3 inches above the base of the plant and just above a leaf and pinch it off.
If mums have not been hardy in your area, you could try potting them and moving them to a more protected area of the garden for the winter and return them to their intended spot in the spring. Established mums can be dug and divided in spring, every 2 - 3 years as necessary.verview and Description: Chrysanthemums or âMumsâ are a stalwart of the autumn garden. With varieties hardy in most climates and their ability to be pinched and forced to bloom at the end of the season, these jewel toned beauties make a welcome splash in the garden when most summer bloomers have begun to fade.