Downtoearthdigs
Answered on June 11, 2019
Yes they can be mixed. But there may be some issues to consider depending on what you are growing, like the source and possible contaminants or plant pathogens in the topsoil, plant requirement for drainage, and susceptibility to soil borne fungal disease.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/types-of-potting-soil.htm
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