Salicylic acid is found in the growing tips of willow shoots, and most fruits and vegetables. However, willow is the best natural source for it. And salicylic acid is a natural rooting hormone.
As for your banana enzymes, do you use ripe or unripe bananas?
http://boards.straightdope.com/sdmb/archive/index.php/t-296132.htmlWhile willow branches contain auxins and salicylic acid, auxins are not salicylic acid.Natural auxin is indole-3-acetic acid. There are also several manmade auxins, such as indole-3-butyric acid or indole-3-propionic acid. Aspirin (acetylsalicylic acid) is not an auxin.
While the tips of willow shoots do contain auxin, I can't find a reliable cite that says there's enough there to promote rooting in plants. This is about as close as it gets: (http://64.233.161.104/search?q=cach...llow+rooting+site:.edu&hl=en&client=firefox-a) Willow water and rooting cuttings ?? A recent article in a popular horticulture magazine lead me to do some searching on this topic. Thanks to Dr. Jerry Cohen, Bailey Chair, in our Dept. for his comments. Many people feel using "willow water" will improve rooting on cuttings, especially roses. There are few, if any scientific findings to substantiate this, so it remains a "home remedy". The following articles explain how to make and use it, but the "auxin-like" compounds in willows do not appear to give consistent, reliable propagation results. Other natural auxin rich sources, such as seeds, may have a similar effect. Commercial rooting hormones are the most consistent, reliable products to stimulating rooting.
I ran across several sites that claim that if willow water doesn't work for you, aspirin might. That's BS. Commercial aspirin should not contain auxins.
I use my over ripe bananas. Really don't know if they help that much in the enzyme department. Maybe enzymes are what I'm looking for. With a well rounded diet, I haven't worried too much about them.