Still new to my gardens, grown from seeds from the Ottawa Wildflower Seed Library
At just a couple of feet in height, this species is quite a bit smaller than Blue Vervain and is well suited to dry meadows and hot, sunny gardens.
Prairie Moon has a full description here
First photo from: By USFWS Mountain-Prairie - Hoary Vervain (Verbena stricta) on Mixed Grass Prairie of Lacreek NWR