Our NutriStar foliage plant food was carefully formulated with trees, shrubs, and evergreens in mind. It features 5 sources of nitrogen, each with a different time-release characteristic to ensure that your foliage has the necessary nutrients to grow when initially planted as well as for the next 4 months to sustain healthy growth. This fertilizer blend contains ureaform, monoammonium phosphate, polymer-coated urea, activated sludge, sulfur, potassium nitrate, ferrous sulfate, magnesium sulfate, calcium sulfate, sulfur, zinc sulfate, manganese sulfate, copper sulfate, and potassium sulfate. Our tree and shrub plant food is an excellent source of nutrients for oaks, willows, ashes, maples, pines, mulberries, yaupons, hollies, oleanders, viburnums, boxwoods, cleyeras, spireas, ground covers, nandinas, and loropetalums.