When to plant mums? Home › Forums › Flower-Garden Questions › Annuals and Perennials › When to plant mums? This topic contains 0 replies, has 1 voice, and was last updated by Anonymous 8 years, 2 months ago. Viewing 1 post (of 1 total) Author Posts September 12, 2008 at 12:40 pm #28436 Anonymous Oh, thank you for the link. So is Spring or Fall the best time to plant? Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.