Solidago canadensis - A perennial herb, Canadian Goldenrod is. A native of both North America and Canada. Used in traditional medicine. Bright yellow flowers held above the foliage from summer through autumn. The flowers are very attractive to beneficial insects. Grows in most moist soils, full sun to part shade. I have mine growing here in shallow water and it is thriving. It can take over a large area, so either contain in pots or allow plenty of space