Indole-3-butyric acid (IBA) is a plant growth regulator rooting hormone also called an ‘auxin.’ Used to root cuttings in nurseries, greenhouses, and for residential use, IBA must be registered with the U.S. E.P.A. When propagating plants from cuttings, IBA helps root formation. Used as directed, IBA is safe for humans, animals and the environment. . Some plant growers formerly purchased IBA from lab suppliers. This practice is illegal. In 2010, the US EPA issued a ‘stop sale order’ for all unregistered IBA and K-IBA from one or more lab suppliers.
Registered IBA plant rooting products are available in two ways: products that make liquid solutions and ready to use dry talc based powders.
Products used to make IBA liquid rooting solutions are Hortus IBA Water Soluble Salts® and Rhizopon® AA Water Soluble Tablets. The Salts are measured by weight, and the tablets are measured by counting. Foliar and basal methods can use the same solutions. Growers who formerly used ‘lab’ IBA can use the same methods and rates with these products. Two foliar methods can save on labor and material cost: the Spray Drip Down Method and the Total Immerse Method. Basal applications are the Basal Quick Dip Method and the Basal Long Soak Method.
Dry Powder IBA rooting products that use the Dry Dip Method include Rhizopon® AA #1, #2 and #3, they are the three most used IBA concentrations.
Hortus IBA Water Soluble Salts and the Rhizopon AA products have WPS Zero Hour REI, meaning production personal can remain in the production area at any time.
When purchasing IBA products, check that they have US EPA registration numbers on the front of the package.
Hummert International can send you a free book on how to successfully use IBA rooting products and give detailed instructions on the five application methods.