Chrysanthemums are hardy perennial plants so will come back year after year if they’re growing in the right conditions.
Apart from matching the right varieties to your winter temperatures, you can encourage your mums to come back year after year by growing them in fertile, but well-drained conditions. Mums also dislike shade, so be sure to plant them in full sun.
They are also more likely to come back for another year if they have been growing well.
Plant your mums in spring, so that the plants have as long as possible to establish themselves before winter.
Also, fertilizing with a liquid feed every two or three weeks during spring and summer will set them up for the winter and encourage them to come back the following year. Cease feeding as flowering begins.