Shop for Garden Center at The Home Depot. The Monterey Dr. Iron 7 lb. Organic Lawn Pellets help correct iron deficiencies which cause yellowing of plants. The pellets contain 22% iron and are great for use on lawns, shrubs, flowers and more. The non-staining, non-burning formula won't damage your lawn, and the pellets are effective for up to 26 weeks for lasting use.