Your plants will grow more robust and be better able to resist bacterial and fungal infections that cause root rot. This specific combination of beneficial bacteria when added to your system makes conditions unfavorable for the growth of harmful fungi, thus helping the plant to defend itself and regain health and encourage the development of fresh roots. It helps fight fungal diseases such as Pythium and Fusarium. Rot Stop does not sterilize the root zone so its natural concentration of beneficial bacteria will not be damaged, allowing the plant to recover quickly. It is a 100% natural product.