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Rooting hormone is a compound that is used to stimulate a leaf or stem cutting to grow roots. The principle ingredient of rooting hormone is a naturally occurring chemical called indole acetic acid also called Auxin or IAA. Root Hormone How To Use Rooting Hormones For More Plants Indole-3-acetic acid -- IAA -- and indole-3-butyric acid -- IBA. What is rooting hormone . The primary hormone responsible for root formation is auxin which includes two naturally occurring acids that stimulate growth. In some cases like African violets all you need is a leaf and you can grow a new plant. Best Liquid Rooting Hormone. When rooting hormones are used the root will generally develop quickly and be of higher quality than when plant-rooting hormones are not used. When propagating plants using a stem cutting it is often helpful to use a root-stimulating hormone. The chemical is found in all types of plants to encourage new growth and it induces cell division root production and fruit dev