Answer: I'm leaning towards recommending a flowering vine for the site you describe. Something like Carolina jessamine, wisteria or even climbing roses. As soon as you get something in the ground, the roots will knit together and keep the soil from eroding. You might even plant a vine to grow up the fence and then plant a groundcover such as wooly thyme to hold the soil in place and help slow water evaporation by keeping the soil covered. A groundcover such as wooly thyme grows thick enough to crowd out weeds, flowers in the summer and has a wonderful fragrance when the foliage is crushed.
Best wishes with your garden!
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