I’ve read Jonas’ enlightening blog post here:
I’ve also seen this Japanese guy’s videos:
He soaks his cuttings for a whopping 24 hours (some vids, up to 48 hours iirc), with 0.40% IBA(iirc) in a 40x water dilution.
In some videos, he even shows the bottle’s instructions (Japanese brands) and the actual bottle indeed says 6-24 hour soak recommended.
What’s your guy’s take on this very long 24hr soak?
Iirc, all the American brand rooting-hormone instructions say only 5min. soak at most… but this guy and also the Japanese brand instructions say much longer soak times.
It seems to work very well, judging by all his videos.