Please excuse me for a moment, but there is a bit too much "graying" of the facts going on.
The hormones in K-L-N and SuperThrive are not diluted 1,000,000-to-1. K-L-N contains about 0.2% IBA + NAA, SuperThrive has 0.04% NAA. As auxins, they do a lot of things (2,4 D is an auxin), but these two primarily affect root initiation and cell growth.
Gibberellins, on the other hand, when used on growing plants, primarily forces elongation of cells. In some situations, that's good (new roots for transplantation, for example). It has tremendous effect on cannabis, so that might explain why it has gotten a bit harder to find. On some plants, all it does is make the plant "leggy".
It is really good for seed germination, and I have heard that is is pretty good as a root dip for preventing transplant shock in vegetables, so maybe orchids, too?
This is from a university publication:
Gibberellins are a group of naturally occurring plant hormones that affect cell enlargement and division which leads to internode elongation in stems. They have a dwarf reversing response allowing certain dwarf cultivars to grow to normal height when treated with gibberellin. They affect many developmental processes, particularly those controlled by temperature and light such as seed and plant dormancy, germination, seed stalk and fruit development.
Gibberellins are used commercially to increase fruit size of "Thompson Seedless" grapes. They are applied at fruit set or shortly thereafter. They also promote male flower initiation in cucumbers when pollen is wanted for hybrid seed production and may overcome the cold requirement for flowering of some perennial plants.
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