Hyssop (Hyssopus officinalis) is a beautiful, well-behaved, easy-to-grow member of the mint family that deserves a place in any herb garden. Older plants form neat, rounded bushes 1 to 3 feet high; younger plants are looser in form. The stiff, erect, typically square stems bear opposite, linear, medium green leaves 1 to 1 1/2 inches long. Tufts of smaller leaves are borne in the leaf axils. Plants are evergreen where winters are mild. Clusters of six to fifteen violet-blue, pink, or white flowers in the upper leaf axils form dense spikes. The two-lipped, tubular corolla is 1/2 inch long and has four protruding stamens that match it in color. The calyx is tubular with five teeth. Plants bloom from summer to fall.