I can get tomatoes with viable seed out of a one inch by one inch ball of soil media. It may require some bottom watering and maybe allow the roots to penetrate into the tray below or even into the soil if you have them outside.
Normally I have good luck with 2 inch pots, but one gallon pots are better. Watering is the trick and I give my plants a top dressing of worm castings from time to time or as a tea.
Tom Wagner
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