and use those, split your doubles so they each have their own pots. But I'd think in the really big tupperware type thingies, you can put in 2. Drill some holes at the bottom and/or on the sides of the trash can, put good potting soil in and they could be happy there.
You can move the pots around when you need them out of the way.
I noticed that tomato plants are really quite the survivors. Some droopy, root bound ones we had in peat pots did great after we planted them in the ground.
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Not sure how big this pot is but you can see a full size orange traffic cone behind it to generalize the size of the pot. It's about to overflow the standard tomato cage thing too. The tomato plant is HUGE already so you really should get a nice big can/pot/tub/bucket for it.
But I'm a beginner and definitely no expert, I just want to get things done, done well and done economically.