I'm trying to plan what to plant along a 6 foot fence that will be along the roadside, where I need something that will provide good screening from the street and grow taller than the fence (ideally covering the height range from 6-20 feet because the fence will cover from 0-6 feet) and be lush and evergreen. Ideally it'd also be fruit producing but something that the average passerby wouldn't think to pick.
Any ideas? Bananas are an obvious choice given how fast they grow, but people might pick them. Any other ideas? I'd like something that I can plant now and that will provide good screening within a year or two here in SoCal.