This liquid hormone formulation stimulates rapid rooting in cuttings. Liquid Stim-Root’s effectiveness comes from higher concentrations of Indole-3-butyric acid (IBA)(contains 0.5% indole-3-butyric acid the main hormone used to stimulate root growth.), more uniform application to cuttings, and better penetration into woody cuttings. Better rooting than with powders, occurs with many hard-to-root species.