Often used in making hard candy, Horehound grows as an 18″ mound of silvery foliage. When not helped along by gardeners, white horehound uses animals to disperse its seeds. A very tough perennial that can grow in hot dry areas and tolerate little water. Europeans have used it as an anti magical herb. Flowers: Tiny to ¼ inch long, white, growing in dense round clusters where leaf meets stem. Error posting question. Sales Tax Information. It is a grey-leaved herbaceous perennial plant. 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