Just when other plants seem to call it quits in the cool Colorado weather, mums begin to hit their stride. According to Good Housekeeping, on average, garden mums will not start to set buds until the night lasts about 10 hours – typically sometime between September and October. Blooms will follow in the next six to 10 weeks. And as the colder weather intensifies, mums will keep their colors and blossoms until the first hard frost. Though they are considered a hardier plant, mums do need specific care to add their brilliance to your landscape. Here are five common mistakes you might be making with these beautiful fall flowers.