Monterey Epsom Salts is a magnesium source that helps plants produce chlorophyll. Product is absorbed through the roots and foliage of plants. It is OMRI listed for organic gardening and can be applied directly to the soil or as a foliar spray. About Monterey: Monterey Lawn and Garden Products is a leading distributor of plant protection chemicals and fertilizers. We strive to offer home gardeners the same professional-grade technology available to the agricultural industry. Our growing line of products provide economical and effective solutions to yard and garden problems and are properly registered and labeled to be sold to and used by the home gardener.