colloidal sliver can do this
kelp will give you aminoacids the advantage being the plant it self can save energy producing them
the effects i have seen so far have always been very limited and not very clear
but that should not keep you from trying!
Hi,
Joost from Holland. Experienced commercial grower for 30 years, of mostly Phals.
Into breeding and tissue culture, but kind of anything regarding orchids.
Thanks for having me,
Joost.