I have about 30 plants that I grew for my daughter's calf club, have packed them all up today and got them ready and noticed something. The plants that were growing in Terrazilla potting mix (from the old SOG stores, there are no online references to that anywhere) are about a time and a half larger than the ones that were growing in the other potting mix you get from SOG (again I forgot the name, it's a white bag with yellow/brown label from memory). Terrazilla was sold out so I used that other stuff. Also the Terrazilla plants are much darker than the other ones.
I didn't use any ferts when watering, they all god the same amount of light and water, and temperature was the same. They were even mixed in with each other so they werent sitting in groups. The only way I can tell is that there are big chunks of pumice in the Terrazilla mix so thats how I was able to separate them.
So look at the pics, and if you find Terrazilla at Hyalite stores, definitely grab it, its worth it's weight in gold!
There are 4 varieties here (left to right - Reaper, Moruga, Choc Brazillian Ghost, 7 Pot Douglah). The plants closer to the greenhouse are using that other mix, the ones closer to the camera are using Terrazilla:
Here the Terrazilla plants are on the right, and the other ones are on the left: