Marrubium vulgare
White Horehound is an introduced perennial herb with crinkled, white-woolly leaves and dense whorls of tiny white flowers with hooked calyx spines. Native to Europe and historically used in herbal cough drops, it aggressively colonizes disturbed limestone pastures and dry roadsides, where its hooked seed burrs cling to livestock wool.
Height: 1-3 ft.
Spread: 2-5 ft.
Foliage: Deciduous
Growth Rate: Moderate
Water Need: Low
Sun Need: Part Sun, Full Sun
Substrate / Soil: Limestone, Loam, Gravelly
Bloom Season: Apr, May, Jun, Jul, Aug, Sep
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