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Our Midwest Hibiscus moscheutos, (a.k.a. swamp mallow), is an herbaceous plant that has flowers that look so exotic that it seems tropical, but it is hardy zones 5-9.
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There are over 200 species of hibiscus, and they are beloved because of their big showy flowers and green, clean-looking foliage. They fall into three different major categories: tropical, perennial and hardy.