Which potting soil to use for grow boxes on a balcony?

Pueblo West, CO(Zone 5b)

I garden in grow boxes up on a balcony and need a high quality potting soil, light weight but substantial enough to support flowers, vegetables, and herbs. I've got to fill six big boxes.

I don't want synthetic fertilizers or moisture retaining additives in the mix. (Miracle-Gro)

Does anyone have a favorite container mix that they could recommend?

Thanks everyone!

(Arlene) Southold, NY(Zone 7a)

Fafard. They make many types of mixes so check their site before you buy.

Harvard, IL(Zone 5a)

Fafard makes a good mix. We prefer Ferti-Lome (no connection to FertiSorb), which is made by Lambert .

Dublin, CA(Zone 9a)

You might also check out some of Al's (tapla's) recipes for making your own container mix in the sticky thread at the top of the forum.

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