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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.
If you cut back now, yes they will still bloom in the fall. ===>>>. they need to be pinched back about 2 to 3 times in summer to bloom in fall ... i havent done mums in years.. but i recall something like 4th of july.. 4th of august.. gives plenty of time to rebud by fall ...