Marsh Betony

About Marsh Betony

Marsh Betony is a sophisticated late-season wildflower that adds elegance and ecological depth to wet, sunny landscapes. Also known as Swamp Lousewort, this perennial produces upright stems reaching 1 to 3 feet in height, topped with dense clusters of creamy, hooded flowers that bloom from August through October. Its attractive, lance-shaped leaves are deeply toothed, providing a fine-textured backdrop for the late-summer garden. Native to wetlands, fens, and damp prairies across the northern and central United States, Marsh Betony is a specialist of saturated soils. Like its cousin Wood Betony, it is hemiparasitic, helping to maintain plant diversity in moist environments by moderating the growth of dominant sedges and grasses. The flowers are specifically shaped to be pollinated by bumblebees, which are strong enough to push into the hooded blossoms to reach the nectar. It thrives in full to partial sun and requires consistently wet to medium-wet conditions. This is an essential species for rain gardens or shoreline restorations where both beauty and biological balance are desired.