If your plants can't seem to stay green, try Greensand. Rich in iron (17%), it's been used for more than a century to amend iron deficient, high alkaline soils. A natural occurring element called glauconite in Greensand loosens clay, binds sand and increases water-holding ability, making it an excellent soil conditioner for lawns, gardens, flower beds and even container plants. Easy to spread or mix, safe to handle and odorless. A 5 pound bag covers about 100 square feet.