Yeah,I know a little about teas, and use them regularly, the soil I have been growing in for the last 50years, is MsDelta soil, sweet smelling, black soil, and I just add some perlite to it. My Granda, was a farmer, all his life, and I've heard him say many times, that Ms.Delta soil was as rich-fertile ,as three feet up a hogs ass, I don't know about that, but MJ, sure loves it, and thrives in it.
Have a nice evening.