These bulbs often require dividing or replacing after two or three years, just like mums. But there's a hitch. The best time to dig and replant spring-flowering bulbs is early fall, when mums are at their peak. So, at some point you must choose between keeping your mums or your bulbs, which is not difficult since mums multiply as willingly as rabbits. Pots are ideal if you must wait until bulb foliage dies back to renovate your bed.
Few plants develop roots as rapidly as chrysanthemums.
You can also root the stem tips you pinch from your plants in spring by sticking them in damp potting soil, sand, or vermiculite. Even with no help from rooting powder, stem cuttings will start rooting within a week. Collecting and showing them is addictive. Whether you want to compete or simply collect mums, the National Chrysanthemum Society has 43 chapters across the country. How to Transplant a Blooming Mum Spring is the best time to plant chrysanthemums, but you can set out blooming plants in fall if you're careful.