Answer: I can understand why you want to keep your chrysanthemum in its pot. My suggestion is to enjoy it on your deck or patio until it stops flowering. At that time, don't move it into the garage, but bury the pot in a garden bed for the winter. Next spring you can unearth the pot and enjoy your mums for another year.
After they finish flowering, garden mums should be cut back about one-quarter their height. In late January or early February cut them back to about 3 inches from the ground. New growth usually begins in February or March ? when new shoots appear at the base of the old stem stubs.
Best wishes with your new plant!
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