i have a casdacing juniper bonsai also, I haven't really pruned him too much either, better to prune a little than a lot, or so I was taught by the people who sold it to me. I'm trying on getting a nice shape by training the branches to curve with some copper wire. They do quite well in colder environments as long as they get ample sunlight. You should post a picture of yours, I'll get one of mine up here and maybe we'll find some other bonsai people.