So im new to this site and I have been planning an outdoor grow I got the site picked out, got my seeds 10 Lowryder 2, 5 white widow. the grow site has some big trees around some light loss is this gonna be a problem??(big enought to fine new site?) also the ground is sand but from what iv read it would be better to dig the holes out and make my own potting mix? recipies for that or advise against it?