Invaders! Japanese Knotweed

This infestation was first documented in 2011 by the Coastal Conservancy. It is currently observed in the San Geronimo Creek Watershed at Two-Bird Café, extending downstream to the bridge where Meadow Lane crosses the creek.

Why Is It So Bad?

 It clogs waterways & reduces the quality of habitat for wildlife & fish.

 Reduces the food supply for juvenile salmon in the spring

 Dead stems & leaf litter break down very slowly & form thick organic layers that prevent native seeds from germinating.

Identification: Typically found in wetter areas; floodplains, riparian corridors, seeping springs and septic leech areas. The leaves are triangular-shaped with an elongated tip and its stalks appear as canes similar to bamboo which spreads mainly by broken root segments or by broken stalk segments.

Critical to Know: If you identify this plant on your property, PLEASE contact Sarah Phillips with the Marin Resource Conservation District at to coordinate a demonstration on how to properly remove the vegetation. It’s important to remove it appropriately as to not encourage further spread.


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