A new and distinct cultivar of winter-hardy, herbaceous, perennial, hybrid Hibiscus plant named ‘；Holy Grail’； comprising a rounded mound habit of multiple, well-branched, basal stems producing flowers from the bottom to the top of the plant from late July to early September. Flowers have petals with strong red with dark red shiny eye set off with column of light yellow pollen. The foliage is ovate to rarely three-lobed, and deep mahogany-colored and the light green calyces provide sharp contrast.
