I'm a big believer in using quality potting mix in your containers. However, when I had a plant left over that I didn't want to waste, I jammed it into a clay pot of Georgia red clay dug up from my yard with a handful of peat in it. This thing isn't going to be outdone though. Look at the fruit set on it (many cases of two per node) and the blooms! This is the "Little Engine that Could". I'm ashamed of myself for not giving it a better place to put its feet. Life is strong.
Mike
Mike