Originally tested and approved for use in agriculture for organic production of fruits and vegetables, it is now available to homeowners in Robusta Rose Care. An extract of giant knotweed, Reynoutria sachalinensis The active ingredient in Robusta Rose Care boosts plants immune systems and making them able to resist common diseases. Robusta Rose Care has the following advantages for home gardens: Prevention of common rose diseases such as black spot, powdery mildew, and rust. Prevention of common diseases on Zinnias, Begonias, and Snapdragons, bacterial spot and late blight of tomatoes, powdery mildew and botrytis bunch rot on grapes. Rate: Spray foliage every two weeks as a preventative. Spray every week if the disease is already present, once under control switch to two week intervals to maintain the health of the plant. The active ingredient in Robusta is compliant with the National Organic Program (NOP) for use in organic crop production. and is OMRI Certified