Anyone of you had experiences with Superthrive? It's not a fertilizer, but it helps plants grow. It has been around for decades, and nurserys and other professional growers swear by it. It contains more than 50 vitamins, hormones and other bio-usables for plants. You can add it to houseplants, outdoor plants, flowers, garden plants, shrubs, trees and any other kind of plant you can think of. I use it for several years on my cacti and I must admit that it really helps. Especially for rerooting cuttings it is very good. It was only available in USA, but last years more and more for sale on the internet and in bonsai shops.