Natural fungicides are organic or natural based formulas used to combat fungi, mold, and mildew in your indoor garden. Fungus can sneak into an indoor garden when you least expect it, and with spores floating through the air on a constant basis, it is difficult to completely exclude …fungus from your tent. Once established, it can hamper the growth of plants, kill seeds and seedlings, and destroy plant leaves and stems. Growers utilize natural fungicides to keep their garden fully organic while keeping fungus at bay. HTG Supply carries several natural fungicides safe for use in your indoor garden!