Answer: Solanum rantonnetii, the potato vine, has a shrub-like habit, growing 8-12' tall and 6-8' wide. It will cover the slope, but might grow too tall for the site. A better choice is Solanum seaforthianum, Brazilian Nightshade. It's an evergreen vine, growing to 15', and bearing cluserts of violet-blue, 1" wide flowers.
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