AI: 00.%3 Indole-3-butyric Acid. Hormodin is a root inducing plant hormone. Hormodin is a formulation of indole-3-butyric acid (IBA). IBA is a synthetic auxin rooting hormone, which acts as a root stimulant. Hormodin 2 is prepared specially for propagating many woody and semi-woody plants, including some of the evergreens.