Monterey Epsom Salts, 4 lbIn store location: @B18 Monterey Epsom Salts, 4 lb Monterey Epsom Salts can make a big difference for plants. Magnesium sulfate and sulfur are absorbed through leaves and roots to help them produce chlorophyll. Epsom Salts are so reliable, theyre recommended by rose societies for the excellent blooms they promote. Apply a handful of times throughout the growing season for best results.