Answer: The plant you describe sounds like Shrub Althea, commonly called Rose of Sharon. The botanical name is Hibiscus syriacus. As the flowers on your Mom's plant suggest, it is a member of the hibiscus family. Shrub Althea is a hardy perennial, growing about 10' tall and 6' wide. It's easy to grow, prefering heat and drought to cool, moist growing conditions. It's a rather common plant so you shouldn't have any trouble finding additional information - now that you know the plant's true identity!
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