Answer: You would want to treat it like a tip cutting. Here are directions on how to do that. You may need to cut and paste the complete url into your browser to make it work correctly.
Also, in very early spring once the ground is thawed, you can sometimes stick a branch tip into the soil outside in the garden and in a few months it will be well rooted and begin to grow. Good luck with your pussy willow!
Q&A Library Searching Tips