Saving Soil

I don't understand the question.

You opened the bag, watered the soil, but didn't grow anything with it? If so, then why?

Or you grew with it and are asking if you can reuse it?
 
Agreed. Bagging the wet soil can cause mold, don't do that.

If you used it to grow once before I would not use it again. Despite having not put nutrients in the soil, the previous plants have put in their wastes. Or you could do like User suggests and compost it first.
 
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