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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 you want your mums to bloom in the fall, you should start cutting them back early. Keep them trimmed low until around the end of June. (Some people use July 4 to make it easy to remember.) If you don't keep them trimmed, it is too late even in June. Once all the buds form, cutting them off means removing the flowers.