Out of the millions on the earth, the few I know are the ones I use, otherwise I have no need to study them, because such a thing is an endless study that some people spend their lives doing as enjoyment. If you search the web or the old european / german herb books, you can study for a lifetime and of what value "IF" you can't go out and find the herbs or easily purchase the real thing.

Dr. Christopher was a big believer in living under your own fig tree, which simple means "near home" and 80% of what I use I can find locally if I so desire, while maybe 20% are grown in warmer climates and not available to me here.

The herbs of the amazon is a vast study and endess as well.

MH