Purple Giant Hyssop (Agastache scrophulariifolia) Purple Giant Hyssop (Agastache scrophulariifolia) Native RangeWoodland WildflowerBlooms: July - AugustHabitat: Purple Giant Hyssop prefers sun to part shade and can be found in rich woodlands and thickets. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook