I grow tomatoes peppers, currants, brambles, potatoes, and other things in containers. I can't afford it. I make my own mix, it's a lot cheaper and I'm extremely happy with results. My mix is different every year as I experiment. I'm never going back to bagged potting mixes. Frankly I'm not impressed with them anyway. And yes I have used Pro-mix, seems to be all peat moss. I myself prefer pine bark mixes with some peat Fafard potting soil is impressive to me. Others too, as many organic mixes are on the market. I still can't afford any of them. I used to buy them in a pinch Now I can't even do that.