You can also use bark from live older willow branches or trunks. If you go this route, you need to use more bark because it contains less hormones.
[header] How to make a rooting tonic [title] Collect approximately 2 cups of willow branches or 3 cups of bark. [substeps] Choose small, young branches that are no thicker than a pencil. The highest concentration of hormone exists in the youngest branches.