We really had no idea of how to control it when our friend planted it for us. I bet he didn't either..but knowing when to prune it is the key. In the spring when it sets shoots, you can just step on the new growth and stop it from spreading. Quite honestly I wouldn't tell anyone to plant it except in containers. The arborvites will do the job for Rick, it just may take a couple of years for them to get tall enough and fill in.