Infrequent throughout the state in moist, sandy soil in prairie habitats, in moist soil on wooded banks of streams, in moist borders of lakes, and more rarely on rocky, open, wooded slopes. [Deam also describes P. speciosa, a form in which upper leaves are little reduced in size and the flowers are generally smaller, 8-20 mm long. This form is] infrequent in moist soil mostly along streams. The distribution of this and [Physostegia virginiana] is not known because I did not separate the two species before I made my study of the genus. The two species have always been confused and their range is not known. This species flowers about 10 days earlier than [P. virginiana] and is strongly stoloniferous. Both species do well in cultivation in good, black loam soil. They are easily propagated from seed.