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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.
They should. As perennials, mums are genetically programmed to lose their top growth to the frost, go to sleep for the winter, and wake up with the warm temperatures of the spring. However, you can help the process. When the foliage succumbs to frost, cut the plant back to the ground.Apply a thick layer of mulch (chopped leaves, pine needles, etc.) over the plants. When spring arrives and the threat of frost is over, pull back the mulch and watch your mums rapidly grow.es. If you added granular fertilizer to the soil when you planted your mums in the spring, you might make one or two applications of water soluble fertilizer (such as Miracle Gro) over the summer. If your mums are older than one year, apply water soluble fertilizer once a month throughout the growing season.