Horehound is a hardy member of the mint family. It has fuzzy gray-green foliage and small white flowers. Like mint, this plant can become invasive. Horehound is not fussy about growing conditions but prefers full sun and good drainage. Neither deer nor rabbits eat horehound unless they are extremely hungry. Plant the herb to deter these pests if they are a problem in your neighborhood. Horehound has traditionally been used as a cough suppressant or to make candy.