Iron fertilizer against moss in the lawn – what experts recommend. Iron deficiency is a popular starter for winter-weary lawns, especially in spring.
Gardener Peter Rasch warns on NDR television that you should literally stay away from the product, because iron (II) sulfate can release toxic sulfuric acid. Mein-schoener-garten.de recommends keeping children and pets off the lawn after treatment and only stepping on the grass again after thorough watering or a downpour.