I want to create a living fence. 175 ft long, it's sloped 15 degrees. I want something not too wide, but something that will grow fast for privacy. I want it to grow 10 ft high, but relatively fast within 5 years say? We want to be able to maintain this at that height for years to come without it looking butchered. Ever see stuff that gets too tall, then gets trimmed, and it just has that butchered chopped up look? don't want that. We also want to create it in a raised bed a ft and a half above ground level, say 4 ft wide. Any good ideas, something maybe not normally thought of, that we could choose from???