Herbaceous. 3-5 ft. Sun to Part Shade.
Tall stems to 7 feet tall of clear blue flowers from mid-summer to fall, loved by bumblebees. Perfect for wet boggy areas where it colonizes quickly to form large colonies. Good for dry areas also, where it will not become invasive. Grows well in full sun or part shade. Native to Brazil and Argentina. Leaves smell somewhat pungent.