What exactly is superthrive?

[Undergrounder]

It stimulates root growth in particular. I think the main ingredient are NAA, a hormone for stimulating root growth, vitamin B1 which is practically useless and a bunch of vitamine/minerals which may/may not do anything.

I've never done a control group study but i think if you search these forums and others you will find someone who has. Overwhelming consensus is that it does lead to markedly improved growth.

While stimulating root growth, it may also hold back growth of the main shoot. I have been using it for about a year now and noticed markedly better root growth and generally good leaf growth on my Phalaenopsis orchids. But to be honest, the leaves do seem to be a little small compared to the root systems. Interestingly, when i transfer my orchids to sphagnum (where they don't get any superthrive), they almost instantly start to chuck up a few big leaves.

As a result i'm considering only using it for deflasked plants, repotted plants and any other time i want to get something established.