Hello, After reading this forum for quite sometime I wanted to finally ask a question. I live in surrey and I am completely redoing my backyard. My property is lower than all my neighbours. I have flattened my backyard and put retaining walls all around the perimeter. Creating a 30" wide bed to plant something for a privacy screen. I probably need at least 12 feet of height, but more wouldn't hurt. I would love to do running bamboo. I am just wondering if a wooden retaining and barrier could hold it? I cant afford to have it sneaking into my neighbors yards. If running is too risky I woulnt mind trying a clumping bamboo. But it would have to be a very vertical one because my walk ways and living space will be right beside these retaining walls in a smallish backyard. Any advice, recommendations or suggestions would be greatly appreciated...thanks.