Hi, this is my first message on Dave's garden! I recently got addicted to roses and need a twelve step program, but that is a different story. How do mums grow around the bases of roses? Does either one suffer? I have such a small yard, I need to use every square inch.
Welcome, cistandley! I've found that roses do best if they aren't crowded by other plants. How about growing your mums in pots? The plants would also be more versatile that way, because you could move them around your yard at will, and the roots wouldn't compete with the plants in the ground.
An idea: Try interplanting your mum plants with your favorite spring blooming bulbs. The emerging mums hide the dying foliage of the bulbs and you get two rounds of flowers in the same place. I have had good success with this method with daffodil bulbs planted beneath mums.