Fall mum plants bloom -- that's right -- in the fall! Some members of the chrysanthemum family, such as shasta daisies, bloom in the summer. However, most autumnal mums will bloom from August to November. The exact time frame of your mums' blooming season depends on the variety of mums. Different cultivars come into bloom at different times, based on their response to day length. Early season mums can be expected to bloom in early to mid-September, mid-season varieties from middle to late September and late season varieties from late September to early October. Because mums are fall-blooming, they are the perfect decor for football season, Halloween, and even Thanksgiving! Just as most flowers are beginning to fade, mums hit their stride.