3-2-1 mix as cheaply as possible
Hi, I'm going to be using raybo's 3:2:1 mix for some 5 gallon SWC's this summer.
I'd like to save as much money as possible, and the Miracle Gro Potting Mix required for the recipe is a bit expensive ($7.00 / cf).
How can I go about mixing my own substitute for the MG potting mix?
I've looked through these forums but haven't found a solution.
Also, are other brands of potting mix acceptable?