FoxFarm Bush Doctor Liquid Iron give your plants a shot at greatness! Iron is essential to plant growth, playing a vital role in green up, energy production, and nitrogen fixation. FoxFarm Bush Doctor Liquid Iron is like a nutritional supplement for your plants, giving them a boost of iron when they need it most. You wouldn't train for a marathon without taking a supplement, would you? Use on trees, shrubs, citrus, roses and lawns. Prepare your Plants to PERFORM! OMRI Listed and CDFA Registered for Organic Gardening.