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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.
1 If youâre planting mums as perennials, itâs best to start in spring in full sun to give roots a chance to get established. 2  Plant the mums in well-draining soil, making sure to leave 6-12 inches between each plant and water frequently. 3  Before winter, protect the mums by covering plants with several inches of mulch.