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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.
Yes. 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.