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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.
Once your fall mums start re-growing, remove the old stems. Start feeding every month until August., To encourage branching and compact bushy growth it is important to pinch the plants in the early spring. Once the plant has reached 4- 6 inches, remove 1-2 inches of the new growth on every shoot.