Lysimachia clethroides
Masses of white curved flower spikes bloom atop the foliage from July into August. Grows 2-3' tall and colonizes by underground rhizomes to form a mass 3' or more wide. Good for cutting and arranging.
Best in moist, well-drained soil in part shade. Tolerates deep shade. Spreads slower in dryer conditions.
Gooseneck Loosestrife