My soil mix is primarily Roots, but I add some 3B professional mix for bulk, then some organic Epsoma 3-4-6 dry (6% calcium)"tomato" fert, with all the bennie bacterias, some earthworm castings, splash of dolomite, splash of azomite, and some "root rally" with Mike. makes for an excellent mix that I only need to liquid feed very lightly throughout. I also transplant from one gal. containers to the 5 gal. buckets at the time of 12/12 switch, and roll the root balls in the root rally before I put them in their big pots. They will have plenty of room and nutes to finish out nicely.