Answer: Kinder St. Louis, MO A.You are asking a lot from a ground cover! Rocky clay soil, weedy, subject to lots of water/erosion. If you don't mind a "wild" look, crown vetch might be a good choice. It is a perennial ground cover growing to a heightof 18" or so, commonly used as erosion control. It is hardy, and can withstand the conditions you are describing, and provides a beautiful show of small, pink and purple flowers throughout the summer. If the site is sunny, and you want a slightly more "manicured" look, you can try daylilies. If it is shady, try periwinkle.
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