Plants often root more successfully when you use a rooting hormone, but you don't have to buy a commercial product. This is a guide about how to make your own rooting hormone.
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Use honey as a rooting hormone. Prepare cuttings and dip ends of the cuttings in honey.
By tip-tip from St. Louis, MO
I read somewhere that Weeping Willow branches don't need rooting hormone. In fact, if you take a branch and boil it in some water, that will itself make rooting hormone for other plants to grow roots.
I don't plan on planting one in the yard but I think it is nifty that a branch from this tree will cause other plants to root out. I am taking a gardening course too. Of course not having that, I use honey as a rooting hormone when I need one.
By Robyn 
Making your own rooting hormone with willow water.
Here's what you do:
Now remember since this method isn't very exact, the strength of the willow water can vary depending on the time of year, the number of twigs, the concentration of hormones in the twigs, and the amount of time that the twigs were soaked. You will, however, still get a solution that will help your plants root.
By Sherry from Silverdale, WA
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Here are questions related to Make Your Own Rooting Hormone.
I know you can make your own rooting hormone dip with willow branches. But can you make it with other rigorous rooting plants such as mulberry bushes by soaking their branches or roots in water for a while? What about kudzu?
Hardiness Zone: 6b
By Phillip from Michigan City, IN
bsvgs - dip the ends of the cuttings in honey (no water)
I recently saw a gardener using honey as a propagating hormone. Was the honey raw honey or will processed honey also work?
By Jackie P.
As far as I know honey doesn't have any hormones in it that plants would use for growing roots. However, I could be very wrong about that! Honey is a really good anti-bacterial agent, which would help to keep diseases out of the plant's wound opening while it grows roots of its own accord. I haven't tried using honey on cuttings but I'm certainly going to give it a shot!