American Calamus plant, Acorus calamus “americanus”, is also known as Sweet Flag and Sweet Sedge. This cultivar is from the northern prairie states of the USA – not Europe or India. The toxic beta-asarone content, of the unselected species, is low to none in this selection. An aid to digestion, to sharpen the mind and break nicotine dependance. American Calamus plant is indigenous to the Northern America and prefers lake edges, swampy ditches or marshes in a protected position. Frost resistant but drought tender. A perennial plant, growing to 1m x 0.5m.