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This is really nothing new, nor earth-shattering.  Among a myriad of other phytochemicals, Kelpak contains brassinosteroids and it has been used on foods, fruits, nuts, and grains for over 40 years to boost production.


I have not heard of a single plant harmed using it at doses as high as 2%. The most I recommend is 1:125 (0.86%) as I’m not certain there’s a significant cost/benefit to using more.  My normal dosage is half that.


One large, well known orchid nursery to whom I had given a bottle at a show ended up buying a bunch when the place was being sold, “so all the plants be their best with active growth and good roots”.


I have first-hand experience with the negative effects of overdosing synthetic auxins.  I am not aware of any such effects of natural ones.


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