an interesting recipe to propagate plants:
‘here’s all it takes to make your own rooting hormone dip. Find a healthy, vigorous willow tree and take several cuttings of its branches with plenty of fresh green leaves on them. Any variety of willow will work. Where I live, willows leaf out just ahead of almost any other tree in the spring, so if you don’t have a willow tree of your own, keep your eyes open in spring to locate some in the wild or in parks. Look near running water or in swampy areas. Spring is a good time to propagate things from cuttings too, so it seems fortuitous that willows are conspicuous at this time. Strip a small pile of leaves from the willow branches and chop them up finely as you would a culinary herb. Including some of the very soft willow branches in with the leaves is fine. You should have 2 cups (~ 0.5 liter) of well chopped willow material. Put it in a large non-reactive container, such as a stoneware bowl. Cover with 1 gallon (~ 3.8 liters) of boiling water and let it steep overnight, up to 24 hours. If you can’t boil water, room temperature water will do, but let it steep for a full 24 hours.
That’s your rooting hormone dip, ready to use as you would any commercial rooting dip. After it has steeped you can store it, tightly covered, in the refrigerator for up to two months apparently. But if you have easy access to willows, it’s probably best to make up a fresh batch each time you want to propagate from cuttings. This willow rooting solution has the added benefit of retarding fungal, bacterial, and viral infections in the cutting. So you can soak your stems in the willow solution immediately after cutting them if you need to get your pots and soil ready. Pretty nifty, I’d say, for a product that’s free for a pleasant hour or so of effort.’