Answer: Mums are usually sold and grown as seasonal annuals and planted in late summer to fall. Howeever, they can also be planted in the spring. In my experience spring planted mums have a better chance of overwintering although they may or may not be perennial for you. This will depend on the variety you plant, how soon you plant them, and on how well drained their location is. They need a very well drained spot to overwinter successfully.
,In general perennials only bloom for a week or two each year, at the most. (For consistent bloom all summer you would need to plant annuals.) For a succession of bloom with perennials, you could use spring bulbs along with bearded iris, bulb lilies, coreopsis, shasta daisies, daylilies, purple coneflower, border phlox, sedums and asters. This should take you all season into fall and there are many additional plants you could use as well. I hope this helps.
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