If I was buying grow media for potato bags... which I never have. I would probably do something like 1 part sand, 1 part peat, and .5 parts well rotted but still with some carboniferous woody bits swimming with mycorhizia type compost. Something like that would sound good to me.
Freakin' hippies and Squares, since 1986
Location: Western Washington
posted 6 years ago
Oh, and probably a couple ounces of Lime to go with that peat.