Chrysanthemums are flowering herbaceous plants but are mums annual or perennial? The answer is both. There are several species of chrysanthemum, with some being hardier than others. The perennial type are often called hardy mums. Whether your chrysanthemum will come back after winter depends upon which species you have. If you aren’t sure which one you purchased, the best thing is to wait until next spring and see if there are any renewing leaves poking up from the soil.
Read more at Gardening Know How: Chrysanthemum Information: Annual vs. Perennial Chrysanthemums https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/annual-vs-perennial-mums.htm