Use Stim Root 3 – 0.8% Indole-3-butyric acid IBA for harder/woodier cuttings. Stim-Root #3 is especially formulated to encourage quick establishment of roots on hardwood plants. Like other rooting hormones, will not make roots grow but enhances the plants ability to produce roots.
Simple to use: place a small quantity of Stim-Root in a smaller container. Dip lower 1 cm of cutting into Stim-Root. Tap to remove surplus powder. Plant into rooting medium.
Stim-Root, like other rooting hormones, will not make roots grow, rather it enhances the plants own ability to produce roots by supplying plant hormone at the point of rooting to help initiate root development.