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I haven't grown any in a few years, but I used to use containers to grow them. Three gallon pots, sitting in plastic trays. I filled trays with water, and about a tablespoon of fertilizer and a tad of lime. I changed this mixture each week, and put them in the sunniest spot I could find, on a big table I built out of lumber that I scavanged from trash piles. I had incredible results, and the biggest problem I had to deal with was finding a way to keep them from being blown over by the wind. I finally settled on a string lattice, horizontally administered, with posts I nailed to the corner of the table. In the wind, they were so large and top-heavy this was necessary.
I used about half potting mix, half pete moss, a bag of perlite, vermiculite, a little lime too. It'd cost me about $40 to $50 to set up, but I would get way more tomatoes than that, and so much tastier than even curb markets.
One other thing, specifically related to your comment. When they waned in the middle of the summer, you just snip off a undiseased top, and put it immediately in water. Cut the rest of the tomatoe off, and then put some rootone on the cutting, poke a hole in the same mix, and plant it, leaving only a sprig above the surface, and it'll grow back like crazy. I live pretty far South, so the plants are really trashed by then with fungus and insects, so they wouldn't regenerate here.
I should do that again next year. You really have to fill those trays though, as in the summer they suck up all the water in one day, or it evaporates.
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