Thanks a lot for the tip! I remember my granmother used to put some aspirins on the soil of her plants, but I never understood why! To be honest I still don't know why she did that, but it's good to know that aspirins are also good for plants
By the way... I had no idea that aspirin could be used as a good alternative to the rooting hormone. I can't believe how much I'm learning over here I'll also check the inverted soda bottle method you mentioned. I had heard about it, but I never felt that interested to find out how it worked.
Aspirin is supposed to help plants root because it's made from willow, which is a natural rooting hormone. Willow branches are one of the easiest plants to root as cuttings. I was once given a branch about an inch thick. I put it in a glass of water and within a week it was sprouting roots everywhere. I foolishly gave the tree away because I'm short of space and I thought it was ugly, but I've got a thinner one grown from a cutting which is thriving in a pot in my backyard. I need to reduce the height, so I will be rooting the top half shortly.
As a matter of interest for those interested in home remedies, I just came across this article about making your own aspirin from willow. I doubt I'd ever be brave enough to try it though.