arlinek,
As you live in a mild climate in San Diego, have you thought about planting a second "cover crop" in the cooler season, to then stir up in the container before tomato planting season rolls around? I am thinking of legumes or some other in-ground crop that would bring some natural "balance" to your potting mix, to counter the effects of the prior tomato plant.
For example, I am growing Snow Peas in the cooler "season" up here in Campbell, to both give me a Winter crop, but to balance the soil a bit. I know Snow Peas are not the ideal "cover crop", but you get the idea....
Ray
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