AI: 00.1% 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 1 is a general purpose powder designed for the grower who propagates plants such as roses, carnations, poinsettias, some shrubs and most soft herbaceous plants.