Glyceria septentrionalis, commonly known as Northern Mannagrass or Floating Mannagrass, is a perennial grass native to wetlands across North America, including wet meadows, marshes, and riparian zones along streams and rivers. It typically grows to a height of 1.5-3 feet (0.46-0.9 meters) and is characterized by its upright, clumping form. The plant produces green, inconspicuous flowers that bloom in the summer, which are not particularly showy but are valuable for native wildlife.

Northern Mannagrass is appreciated for its ability to stabilize soil and provide habitat for wetland wildlife. It is often used in rain gardens, wetland restoration projects, and as a water’s edge or bog garden plant. This grass thrives in full sun to part shade and prefers consistently moist to wet conditions, making it suitable for areas that are too damp for many other plants. It is adaptable to medium or slow-draining clay or loam soils. While generally low-maintenance, it can spread aggressively in ideal conditions, so care should be taken to manage its growth in smaller garden settings.CC BY-SA 4.0