Stop the yellow: When and how to apply iron for greener lawns, trees, and gardens

Stop the yellow: When and how to apply iron for greener lawns, trees, and gardens

Iron chlorosis is the yellowing of leaves caused by an iron deficiency. This Pin oak shows brighter green veins with yellowing between the veins. | Photo Credit: Joseph O’Brien, USDA Forest Service, Bugwood.org. If your trees or lawn start the season looking more lemon than lime, you may be seeing iron chlorosis—a common nutrient problem across much of the west. It’s especially noticeable in early spring, when new leaves emerge pale yellow, but …