Why oh why won’t the Wisteria bloom? Home › Forums › Tree & Shrub Questions › Tree & Shrub Questions › Why oh why won’t the Wisteria bloom? This topic contains 0 replies, has 1 voice, and was last updated by Anonymous 8 years, 5 months ago. Viewing 1 post (of 1 total) Author Posts July 2, 2008 at 8:10 am #28171 Anonymous I have a wisteria that only blooms with hard pruning the year before. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.