I was wondering if there is some substitute, perhaps a dietary supplement from a health food store, that I could prepare somehow to use in place of a seaweed extract which I cannot find here and no one will ship it here?
Can anyone offer any suggestions? Thanks in advance
Seaweed extracts are intended to be supplements to fertilizers, not replacements for them. Your plants will do far better with regular, dilute fertilizer applications with no seaweed, than they will with seaweed and no fertilizer.
The problem with drug-store seaweed materials is that they are trying to supply different supplemental compounds than those that stimulate plant growth, so will do little for your plants.