Brandi from Ovid, Id writes
The Hi-Yield Grass Killer Post-Emergent Herbicide is labeled to be used for daylilies and bleeding hearts. Unfortunately, the Hi-Yield Grass Killer Postemergence Herbicide does not specifically list fern peonies, tree peonies and other herbaceous peonies on the product label as tolerable to this product. Please tell us more about what you are treating for so that we are able to locate a product that will best fit your needs.
Answer last updated on: 04/05/2017