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Old December 21, 2016   #15
AKmark
Tomatovillian™
 
Join Date: Jun 2013
Location: Wasilla Alaska
Posts: 2,010
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I grow in pro mix, and have used everything from 20 gallon down to 5 gallon, if you can keep them watered you can grow anything in a 5 gallon, maybe smaller. This year I am doing two plants in 5 gallon grow bags, about 2000 of them. The trick is keeping them fed and watered. I have a friend up the road that grows in tiny rock wool cubes, maybe a gallon or so, and he produces massive amounts of market quality tomatoes.
Maybe start with larger containers until you get a feel for growing in them, but I think when you see how much media they eat up you will down size in time.
Good luck
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