Geneva 202 is 30-40% of standard, about M9 size. The interstem MM111/G11 would probably be somewhat larger. For your stated purpose G202 would probably be a good choice. That should get you a 9-10ft tree with modest pruning.

Since you like adventure: Yes it is very unlikely the fruit will be worth eating. But there actually was a Granny Smith. From the variety list of Kevin Hauser: "Granny Smith Australia, 1868 Few folk realize that this is the oldest supermarket apple variety. It sprouted from a washtub of French crab apple trimmings tossed out by an actual granny, Maria Anne Smith of the Ryde District of New South Wales." She got it from a seed so there is a chance (probably at least less than 1:200) And since you like adventure and assuming this seedling is growing in your yard's native soil it will make an excellent seedling rootstock if it survives its first year or two (or five). You can practice all manner of grafting onto it with apple varieties who's scions you acquire locally or through exchange groups. Grafting: I bet you can do it! Here is a link that might be useful: Kuffel Creek Apple Varieties List

Thank you all. Debra and Rita, Gary Colby really showed well that day and I was impressed. I was beginning to think that it is mainly for hybridizing, but it sure can be very pretty. Let us see how it comes about next year. Vickie, Natalie Antoinette looks like it will be a very good performer. I haven't seen it blotch. The color and form are always very good. Julia and Maryl, I really like Granny Smith. The edge is just amazing. It can be a little bit more yellow at the end of the day, but not all the time. The edge always seems to be a different shade. I am really impressed with the ruffling. I have started to use its pollen. It's nice to look forward to how its babies will look like. Petalpatsy, I first saw Captain Blue at Water Mill gardens, but it was high noon, then. It wasn't looking at all like the web picture. Captain Blue's color is unique. I don't have anything like it in the yard. It has grown a lot on me. I love it! Bj

Granny Smith is a variety that is highly susceptible to a disease called fire blight. that is the number 1 disease problem for our area. The odds of growing apple successfully in Georgia go way up if you choose disease resistant varieties such as Liberty, Pristine or Goldrush. Here is a link to a UGA spray program that is pretty good that I follow for the most part. I suggest you start reading the Gardenweb Fruits & Orchards blog, you can learn alot from the site. That is how I got started, I now am growing around 50 apple varieties, all on dwarf rootstock. Here is a link that might be useful: UGA spray program