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First of all I wouldnt even consider for a second, going for containers that large unless you are getting full unobstructed sunlight from sunrise to sunset.... youll get a better harvest if you give your plants a proper start versus just dumping them in a gang load of soil. at that point youd be better off just putting them in the ground or mounds even. plants that are over wintered for months prior to being put outside will perform poorly in comparison to younger smaller plants. you can get 10 lb plants in the right conditions in 300 gallons of soil, no need for any more than that imo, if you still need more yeild per plant, maybe consider multi cropping. I realize most people are adhering to plant count numbers, but like OO said, 5x200 or 10x100 will absolutely crush 1x1000 in both yield and quality, if given a choice Id take more smaller plants over less bigger plants every single time.