I'm sure this question gets asked a lot, but I couldn't find it posted anywhere. What kind of potting soil of mix works best? I am growing plants in 5 gallon buckets. The owner of a reputable nursey recommended to simply use the commerically available Miracal Grow Potting Soil. He said it works well for growing "tomatoes" to their full size. But I have heard that because potting soil is made for indoor plants, which grow slowly and stay in their pots for a long time, it doesn't work for herb or veggies. I've heard that since potting soil is mostly peat it needs to be lightened with perlite, sand, or vermitclite to provide better drainage and air for the roots. I really don't want to deal with the trouble of mixing my own potting soil, so I am hoping he is right- that pure potting soil will work.