I would say about 10 gallons. Not sure. The other large tomato on the right is a pink Berkeley tie dye in the same size pot. In a case like this, the pot is just something to hold the roots. Pretty well all the nutrients past seedling stage come from fert. The potting mix is reAlly just there as a matrix for the roots and something to retain moisture. It's a myth that tomatoes need huge root systems. That's only true if they need to go in search of nutrients. Think hydroponics. Same idea.
KarenO
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