Salvia divinorum

how fast does it grow?
and how many leaves would make up an oz?
anyone know or grown it before?

Depends on how potent you want to oz to be. If you want 40x then you will need 40oz worth of leaves to make one oz worth.

ye i know about the potency and extracting it, read elsewhere its roughly 100-200 leaves per oz,
im just trying to find out how long it takes to grow, i.e 1 inch a week?
all the sites ive been to dont give a timescale as such.

The shits legal y dont you just buy it u can get it anywhere and it sounds long as fuck 2 grow 100-200 leaves per oz and it only grows a inch a week

however it is very easy to make more than one plant... just push it over when it has some length, it will make new shoots and plants where it contacts damp soil... its seeds in nature are basicaly useless or very marginaly usefull.