Just plant some bushes that can stay casual, not severely pruned. I know some people say burning bush is invasive, but here in NJ, they don't give me a problem. I bought the dwarf variety for the same reason, to cover my neighbor's chain link fence. I bought very small ones, maybe 1 1/2 ' tall. Here it is 4 years later and the fence is completely covered. I also have some Rose of Sharon on a small portion of the fence. It looks great.
Here are some pics. The forsythia is on my neighbor's side.
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Upstairs window
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