Anytime you use containers, I believe in using potting MIX and not soil. Soil tends to be heavy/dense and not good for the health of roots imo when in containers. I use regular miracle gro potting mix (whatever can be had at the big box stores) in red party/beer cups and 2.5 months is max for tomatoes in that container size.
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Subirrigated Container gardening (RGGS) in NY, Zone 7!
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