15l minimum for soil in any pot for me and that you have to water every day.
18-20l you might get away with every other day depending on the conditions and plant size. I dont think you can compare yeild to pot size I think its more down to cutting out the risk of problems. Be it running out of feed or the dirt drying out to quick. I like to play it safe and go bigger than I need
"To live is to risk it all. Otherwise you're just an inert chunk of randomly assembled molecules drifting wherever the universe blows you."
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