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Japanese Knotweed

Japanese Knotweed. By Linda Tucker. Polygonum cupsidatum. Also called Fallopia joponica Buckwheat family ( Polygonaceae ) Common names: Japanese Knotweed Mexican Bamboo Chinese Chokeweed Native to eastern Asia. How Did it Get Here?.

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Japanese Knotweed

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  1. Japanese Knotweed By Linda Tucker

  2. Polygonum cupsidatum • Also called Fallopia joponica • Buckwheat family (Polygonaceae) • Common names: • Japanese Knotweed • Mexican Bamboo • Chinese Chokeweed • Native to eastern Asia

  3. How Did it Get Here? • First introduced from Japan into the United Kingdom in 1825 • Was introduced to the United States from the U.K. in the late 1800s • Introduced as an ornamental plant • In recent history, heavily planted at mine reclamation sites in PA

  4. About the Plant • Perennial • Grows between 3 and 10 feet high • Stems are reddish green, jointed, and hollow • Broad, alternate leaves • Flowers: small and greenish white and grow in spikes

  5. What Does It Look Like?

  6. Where is it Found? • Moist environments, such as stream banks, islands, and wetlands • Also found along roadsides and railroads • Can live in open sun or partial shade • Can tolerate harsh conditions such as high temperatures, high salinity, droughts, and floods

  7. Distribution

  8. How Does it Spread? • Reproduces through two methods: • Seeds • Fragmentation of the rhizome • Rhizome can be 40 to 60 feet in length

  9. Ecological Impacts • Japanese knotweed grows quickly and densely • Crowds out native plants and limits biodiversity • Causes stream banks to be less stable and susceptible to erosion during floods

  10. Urban Impacts

  11. How to Get Rid of It • Eradication is very difficult • If it is cut, it will grow back due to the rhizome • It can be dug up, but any remaining rhizome can grow back and you can actually spread the rhizome this way • Herbicides such as Glyphosate and Triclopyr can be used effectively in combination with cutting

  12. How to Prevent Spreading • Don’t plant Japanese Knotweed • Wash your shoes before entering and after leaving natural areas to remove seeds • Do not dig up the rhizome, as you may accidentally spread rhizome fragments

  13. Some Positive Qualities • Excellent source of vitamins A and C • Good source of resveratrol, which can lower bad cholesterol and reduce the risk of heart attack • Tastes similar to rhubarb and can be used in baked goods, soups, marmalades, or just steamed and eaten

  14. References • http://www.in.gov/dnr/files/Japanese_Knotweed.pdf • http://dnr.wi.gov/invasives/publications/pdfs/japanese_knotweed_control.pdf • http://www.forestpests.org/acrobat/jknot.pdf • http://www.wildmanstevebrill.com/Plants.Folder/Knotweed.html • http://www.dcnr.state.pa.us/forestry/invasivetutorial/japanese_knotweed.htm

  15. Questions or Comments?

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