Harmful soil fungi like pythium and fusarium cause root diseases that can devastate the most promising plants. Our all-organic Root Shield forms a defensive barrier right from the start. This university-tested beneficial fungus forms a symbiotic bond with plant roots, protecting them from soil pathogens all season long. Add it to potting soil or mix with water to use as a drench. Three tablespoons mixed with 1 gallon of water protects 25 feet of garden row (approx. 100 sq ft) Protects tomatoes, squash, melons and other plants, too Active ingredient: Beneficial fungus (Trichoderma harzianum Rifai strain KRL-AG2 1.15%)