Easier potting mix for citrus?
I'm a novice gardener, and I apologize for asking a question that has been asked many times before. I did do a lot of reading on these forums about mixes, and I have to say that despite what may be "better for the plant", I'm just not up to the task of maintaining Al's 5-1-1 or a similarly aerated mix for my citrus (three kinds of dwarf citrus and two avocados, destined for half wine barrel planters). I have a drip system in place, but the continual fertilizing, plus the difficulty of finding the ingredients (the guy at OSH looked at me like I had two heads when I asked for partially-composted redwood bark fines, and then tried to sell me bark nuggets) is just not something I'm up to right now.
So, for a large container (half 60-gal wine barrel planters, drilled) in Zone 9 (San Jose, CA) with full sun, and dwarf citrus that I'd like to only have to fertilize once in awhile and not repot until the barrel falls apart... what's my best bet for potting medium?