I was looking into this as well and couldn't really find the info I needed. Most of the articles I found said that super dwarfs are really just small retics selectivly bred to stay smaller and that some people have bought them only to have one end up getting 15 feet or so. As to weather or not this is true I can't say as it wasn't my experience. I'm still trying to find the info as I'm very interested in getting one of these as well one day.