Common Names
Blue vervain, blue verbena, ironweed, simpler’s joy, swamp verbena, verbain, wild hyssop.

Description
A perennial that grows to 4 feet in height, branched above. Leaves are serrated and 3-lobed with 2 sharp lobes arising from the base. Produces blue or blue-violet flowers on numerous narrow terminal spikes.

Flowering Period
July to September.

Habitat
Swales, damp thickets, shores, moist fields, meadows, and waste areas.

Harvest
Herb and root.

Uses
This herb reportedly has been used as an astringent, antipyretic, vulnerary, antirheumatic, tonic, and expectorant.