70 % potting soil , 15 % sand , 15 % perlite or vermeculite. and mix it good. some people mix in some fertilzers to like worm castings or cow manure but i find it better to just add fertilizer when you need it. young plants dont need to be fed for the first 3 weeks so i found it to be easier to leave out the fertilizers out of the mix.:rastasmoke: