Indole 3 butyric acid (IBA)

Marijuana Horticulture

by Jorge Cervantes

Indole 3 butyric acid is one of the auxin growth hormones. It is most often used as an effective rooting hormone. Application of IBA helps generate roots, build a larger root mass, and improve plant growth and yield.

Many commercial formulas are available in the form of water soluble salts. Cuttings can be dipped or immersed before planting. Roots can be dipped or sprayed or the soil drenched during transplanting. Once established, plants should be treated at three to five week intervals during the growing season. After harvest, IBA can be used to encourage regeneration of flowers.

IBA is hazardous to humans and animals. It can cause moderate eye injury and is harmful if inhaled or absorbed through the skin.