Hi, I share a wall with Kam highway, which is noisy and busy with cars and foot traffic. My wall is only 3 feet high so there is no privacy whatsoever. I'd like to plant a fast growing thick shrub that won't spread into the yard too much. Basically I want something at least 10 feet tall that I can keep a foot or two thick that will line the wall which is about 30 feet in length. Bamboo is out because of the mess that it creates. The area gets full sun all day and the soil is rich Mililani dirt. I want to be able to look out the window and see vegetation, not people and cars. Does anyone have any suggestions?