That reminded me, there’s another use for willow. You can use it to make a rooting stimulant, similar to rooting hormone powder but in liquid form.
Chop some fresh green willow twigs into small pieces. Add boiling water, just enough to cover, and let steep overnight. In the morning, strain and refrigerate. It works best if used right away, but it can be kept in the fridge for up to 2 months. A little goes a long way, so a pint-sized jar is probably plenty.