Ornamental grasses Home › Forums › Flower-Garden Questions › Annuals and Perennials › Ornamental grasses This topic contains 0 replies, has 1 voice, and was last updated by Anonymous 8 years, 1 month ago. Viewing 1 post (of 1 total) Author Posts October 16, 2008 at 8:52 pm #28556 Anonymous Thank you for the information. How short should I cut them back? I pobably willwait till early spring. We too are in the north east(PA) Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.