Blue giant hyssop (Agastache foeniculum)

Blue giant hyssop photograph; ? MN DNR, G. N. Rysgaard

Perennial mint to 3' tall growing in dry forests and grassy areas. Small bluish flowers clustered in a spike; blooms in July-August. As with all mints, it has a square stem. Leaves with fine hairs underneath. The root is used medicinally by American Indians