If you are going to use a top soil you are going to have to hand amend it. I too got compost mixed top soil from a company for my raised garden bed. They do not add enough compost for a container type situation. Top soil that will work in an open field will not work in a container. The roots are not able to hold the water very well and there can be problems with oxygen when you use plastic bags. You will have to lighten up the mix a lot to overcome these issues. Are you raising these to sell at market? If you are you will have a hard time watering that many plants twice a day and working a farmers market. Good luck.
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