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Invasive Grass Invades Eastern US Forests
27 Oct
Summary
- Japanese stiltgrass, introduced in 1918-1919, now infests 16 eastern states.
- The invasive grass thrives in diverse conditions, from sun to deep shade.
- It forms dense patches, threatening native vegetation and ecosystems.
Japanese stiltgrass, an invasive annual grass originating from Asia, was first identified in the United States between 1918 and 1919. It is believed to have been accidentally introduced in Tennessee, possibly as packing material for imported porcelain. This non-native species has since become established in 16 eastern states, stretching from New York down to Florida.
The resilient grass can grow in both full sun and deep shade, adapting to moist soils with varying pH levels and high nitrogen content. It readily invades disturbed areas such as floodplains, roadsides, and areas affected by human or animal activity.
Japanese stiltgrass poses a significant ecological risk by forming dense monocultures that displace native understory vegetation. Its spread impacts forests, wetlands, and other natural habitats. The US Fish and Wildlife Service classifies this plant as a high-risk invasive species due to its aggressive nature and ability to alter native ecosystems.
