A new and distinct cultivar of winter-hardy, herbaceous, perennial, hybrid Hibiscus plant named ‘；Dark Mystery’； comprising a rounded mound habit of multiple, well-branched, basal stems producing flowers from the bottom to the top of the plant for five to six weeks from late July to early September. Flowers have petals of pale pink to light pink with strong reddish veins radiating toward margin and dark, red, shiny eye set off with column of cream-colored pollen. The foliage is cordate to ovate and deep mahogany-colored.
