News & Press: Research Updates

Can Japanese Knotweed Reproduce by Seed in Minnesota?

Thursday, April 13, 2017  
Posted by: James Calkins
Japanese knotweed (Polygonum cuspidatum), also called Asian knotweed, Japanese fleeceflower, and Mexican bamboo, and, to a much lesser extent, giant knotweed (Polygonum sachalinense), also called Sakhalin knotweed and Japanese bamboo, members of the Polygonaceae (Buckwheat, Knotweed, or Smartweed Family), are well-known herbaceous perennials that have been planted in American landscapes, including Minnesota landscapes, for over 100 years. Introduced from their native habitats in Asia, Japanese knotweed is native to Japan, eastern China, Taiwan, and the Korean peninsula, and giant knotweed is native to northern Japan and Sakhalin Island to the north (Russia). Both species are long-lived, rhizomatous geophytes that are cold hardy (USDA Cold Hardiness Zone 4) and otherwise quite adaptable (light, soil texture, and pH) and can spread aggressively by their rhizomes to produce large colonies if established in areas where the growing conditions are ideal (adequate light and moisture). Read full article.

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