The Acorus Calamus Marginal pond plant is a UK native perennial that grows to 30 - 60cm in height. Has Green iris - like foliage, and is Aromatic when crushed. Once used on the floors of churches and It has also been used as a thatching material for English cottages. The flowers of the Acorus Calamus are conical green spadix 5-8cm long. Other names it is known by: beewort, bitter pepper root, calamus root, flag root, gladdon, myrtle flag, myrtle grass, myrtle root, myrtle sedge, pine root, rat root, sea sedge, sweet cane, sweet cinnamon, sweet grass, sweet myrtle, sweet root, sweet rush, sweet sedge and listed by John Gerard in 1597 as 'bastard calamus'. In spite of common names that include the words 'rush' and 'sedge', it is neither a rush nor sedge.