Found growing in sand. abundant source of silicon among plants. One practical use of the herb is for polishing pewter. In the field of herbology, horsetail acts as a mild diuretic and astringent for the genito-urinary tract. The astringency makes it invaluable in cases of incontinence and bed-wetting. It is used in the treatment of prostate inflamation and for the dissolving of kidney stones. Because of its high silicon content, it reduces heavy bleeding and helps prevent hemorrhage.