Impact of Indole-3-butyric Acid Concentration and Formulation and Propagation Environment on Rooting Success of ‘I3’ Hemp by Stem Cuttings

As the industrial hemp ( Cannabis sativa L.) market grows, there is a need for methods to clonally propagate parental breeding stock and new cultivars. Information lacking on vegetative cutting propagation of hemp. We evaluated how environment (intermittent mist vs. subirrigation under humidity dome), indole-3-butyric acid (IBA) formulation (talc rooting powder IBA in solution), concentration (0, 3000, or 8000 ppm) affected stem cuttings from ‘I3’, cannabinoid-free cultivar Under domes, quality percent declined at ppm IBA. Root shoot percentage also were reduced 3000 solution treatment compared with talc. Our data show that tested, rooted highest produced highest-quality roots shoots either no hormone talc powder. These treatments did equally well domes intermittent mist.