SuperThrive, K-L-N, and other formulations contain synthetic rooting hormones, Indole-butyric acid (IBA) and/or naphthalene acetic acid (NAA). One stimulates root initiation, the other growth, and I'll be damned if I remember which does what. ST has one, K-L-N has both.
The "harpin technology" of Messenger does not target the root system at all, but is a general plant metabolism "kick starter", so they are not substitutes for each other.
I have just begun my experimentation with Messenger, so will report back ion the future.
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