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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.
When this happens the weight of the flowers and leaves on the stems will often cause the branches to fall over. To prevent this from happening and to maintain a compact shape with more branching, you can pinch mums back starting in early spring and continuing into mid-summer arounf the 4th of July.NOTE: You don't have to pinch or prune mums at all.If you choose not to prune you might only get a short bloom period in summer and it might be necessary to use plant supports to keep leggy stems from flopping over throughout the season.o prevent this from happening and to maintain a compact shape with more branching, you can pinch mums back starting in early spring and continuing into mid-summer arounf the 4th of July. NOTE: You don't have to pinch or prune mums at all.