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Old July 6, 2019   #4
zipcode
Tomatovillian™
 
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,582
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I find onions and especially garlic are not very efficient to plant in containers, so I would say no to that. They require quite a deep container to do well, especially the garlic, so you end up needing a decent amount of not only surface area but also potting mix volume. I have had some good success with shallots in fairly shallow ones however.
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