Is there a fast (ish) growing hedging plant that will be easy to keep and will grow up rather than out? I'm looking for something that is low maintenance as my neighbour complains if branches go out into her area. My neighbours look over my fence, but I don't have enough space for a wide plant like eleagnus. The soil is thick clay, its pretty dry and in a sunny spot. Suggestions please, thank you, freckled hen!