Oneida County Aquatic Invasive Species Program
​​​Stephanie Boismenue
AIS Coordinator
Oneida County Land & Water
Conservation Department

​Oneida County Courthouse, 2nd floor
1 S. Oneida Avenue
Rhinelander, WI  54501
Phone: (715) 369-7835
sboismenue@co.oneida.wi.us

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Reed Manna Grass   Glyceria maxima

Identification: Reed manna grass is a perennial, rhizomatous grass with unbranched stems. Leaf blades are flat and 30-60 cm long. They are shallowly grooved with prominent midribs. Leaf margins have short, stiff hairs that are rough to the touch. Reed manna grass is up to 2.5 m tall. The variegated form of the plant has distinct cream and green stripes on the leaves.

Ecology and Natural History: Reed manna grass is native to temperate Eurasia. It is typically found in marshes, meadows, and along shorelines. It usually reproduces by rhizome. It is thought to be introduced intentionally as a forage species or an ornamental plant.

Impacts of Introduction: Reed manna grass can form large monotypic stands, reducing diversity. Since growth begins in early spring, it can easily out-compete other species by beating them to valuable resources. Reed manna grass is an ecosystem engineer that can change an entire wetland by converting fast-flowing, oxygen-filled streams into partially anaerobic swamps.
It is PROHIBITED to possess, transport, transfer, or introduce reed manna grass without a permit in the state of Wisconsin.
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Glyceria maxima variegata 
​Variegated Reed Manna Grass
Do you think you have found reed manna grass? Contact us for confirmation.

Stephanie Boismenue, AIS Coordinator
Oneida County Land & Water Conservation Department
1 S. Oneida Avenue
Oneida County Courthouse, (Second Floor)
PO Box 400
​Rhinelander WI 54501

Contact Us:
Phone: (715) 369-7835
Email:  sboismenue@co.oneida.wi.us

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