Swamp rose-mallows (Hibiscus moscheutos) are large flowers, some reaching 20 cm in diameter. They produce white, pink, and red flowers one after another from April to September, however blooming for only one day. Swamp rose-mallows resemble Confederate roses but the former are single flowered and don't change color while the latter generally double flowered, changing from white to pink.
They're beautiful but sometimes make me chuckle with too many (last photo) of such large flowers.
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