It is borderline for a 1 gallon container to produce a rootbound 12 inch seedling. A 12 inch seedling in a 1 gallon container will usually be 12 inches wide. This is the largest size tomato plant I grow and sell from my greenhouse. I don't ship them, but some people want larger started plants so I grow them and sell locally.
One caution, the plants I grow are regularly stimulated by brushing across the tops. This makes them shorter, stockier, and bushier as compared to plants grown using other methods.
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