A tradition that varies by school
Homecoming mums started as a real chrysanthemum pinned to a sweater. Over the years, especially in Texas and parts of Oklahoma, they grew into big ribbon creations with bells, trinkets and the wearer's name. Some schools love them. Others hardly see them.
Not every florist makes mums, and we cannot promise that the one you reach does. Ask on the call. If they do, give them the school colors, the student's name and the date of the homecoming game. If they do not, a corsage or boutonniere is a good alternative. See prom corsages and boutonnieres.
Fall is the season, usually September and October. Order a few weeks ahead if you can, especially for custom pieces.