Hoary Vervain

Verbena stricta 
 
 
 
Drought tolerant plant with strong stems. Oval, jaggedly toothed, 2-inch leaves and stems are covered with fine white hairs, giving the plants a gray-green cast. Small purplish flowers are borne on tall vertical spikes. Useful planted in masses in borders and for naturalizing. The blooms are showier than V. hastata and make an excellent cut flower.  Used for prairie restoration and a very popular plant with butterflies.