Verbena stricta is a native of prairies and savannas, Hoary Vervain thrives in dry-mesic to dry soils with good drainage, but can still perform is normal soils as well. Attractive grey-green foliage is quite fuzzy positioned along square stems. Tall spikes of blue flowers trickle out blossoms all summer. A favorite of native pollinators and seeds are consumed by songbirds.
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Photo #1 By Ryan Hodnett (Own work) [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
Photo3 By Andrey Zharkikh from Salt Lake City, USA (2015.07.09_15.45.33_IMG_2972) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons