Willow juice.
Take some willow cuttings, soak them in
water, and use the water on your new cuttings. Here's a
link which explains the chemistry. If you have any further questions, by all means ask. I use this method myself and it works. I don't know how you are going to find plant growth hormones in honey or cow manure; I think the critters break down compounds like that rather than pass them through.
I didn't even see the postscript with the same link. Yes, it works.