Manchurian yellow loosestrife is a perennial herb with erect, unbranched stems and narrow, lance-shaped leaves arranged in whorls. In summer, it stands out with tall spikes of small, bell-shaped, white flowers that are tinged with yellow at the throat. Thriving in moist, shady habitats, manchurian yellow loosestrife spreads through rhizomes, forming lush colonies that enliven the understory.