(Verbena hastata) Blue Vervain grows naturally along roadsides and tall grassy fields flowering between June and September. It is a tall, slender, elegant, perennial plant. Its leaves are lobed and serrated in shape and have small purplish-blue flowers. The brilliant purple verbena can be seen along roadsides and waste places all summer long. Growing to a height of 2-7feet. It is a freely branching with opposite lance-shaped leaves which are very rough to the touch. This is a common plant that occurs across North America. The plant has no perfume, and is slightly bitter and astringent in taste. They are hardy and drought resistant which makes them great in a Wisconsin climate.