Hoary Vervain (Verbena stricta)Supports over 60 bee species and over 100 insect species. Dry, hot, baking soil? Bring it on. native range centers on about southwest Iowa — you’ll find it at home in Wyoming and Colorado into Oklahoma, then east to Arkansas, Ohio and Michigan, and north into Minnesota and the Dakotas. reaches 1-2 feet tall & wide, blooms June -August mostly full sun. will self-sow in open soil, but in a thick garden bed, it’ll behave if not fade away over time.