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Purple giant hyssop plants are up to 6' tall; the stems are square. Flower spikes are short (<6"). The calyx of flowers is tubular and green; the corolla is ~1/4" long, lavender to pink and occasionally white (the common form in Jackson Park), with an upper and lower lip between which protrude 4 stamens with pink anthers and a style with a cleft tip. Similar to blue giant hyssop (Agastache foeniculum) but the latter smells of anise, has purple rather than green calyxes on the flowers, and the underside of the leaves is white, not green.

Agastache

Agastache scrophulariifolia

purple giant hyssop [Blooms: Jul-Aug]