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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.
However, you need to decide on the first time that you pinch out the mums. The first time you do this should be early in the spring period. It depends on the region of the world you live in, so you do need to consider your zone before deciding when to pinch out your mums.