The Large yellow loosestrife (Lysimachia punctata) is a vigorous perennial that bears clusters of five-petalled yellow flowers with a central red-eye on pale green tall stems from June to September. It is a useful tall plant (up to 36 inches) as it requires no support and has enough foliage to dilute the brightness of the flowers. Pointed leaves whorl about the stems, with a similar habit to lilies. The plant does best in full sun to part shade and tolerates drier sites. To curb spread, divide every two years.