Conservation Commission

Japanese Knotweed (Reynoutria japonica) is an extremely fast growing invasive herbaceous plant in the buckwheat family (Polygonaceae). Native to Asia, it was introduced to the United States sometime during the late 1800’s as an ornamental plant. Unfortunately, it crowds out native species and can grow at a rate of up to 8 centimeters a day in the spring. It’s found in every state except North Dakota, Nevada, Arizona, New Mexico, Texas, Florida and Hawaii.

Many people mistake Japanese knotweed for bamboo, as the stems are jointed and hollow. Unlike bamboo the plant has large semi-triangular leaves that alternate on the stem. It is a large, fast growing shrub-like plant that can grow through asphalt and concrete and reach 9 feet in height. It has large woody rhizomes that can grow up to 10 feet deep and 40 feet long, and remain dormant for years. It can regenerate from rhizome pieces as small as ½ inch.

What can we do to help control the spread of this non-native, invasive, and potentially damaging plant?

Adopt a Roadside / Adopt a Streambank!

Is there a colony of knotweed on YOUR property or nearby along Orford’s roadsides and byways? Is there a section of Jacobs or Archertown Brook on or near your property already being overrun by knotweed?

Would you be willing to volunteer some of your time to help to stop the spreading of this plant?

The Orford Conservation Commission can show you what to do.  It’s easy – no power tools, no chemicals needed – but persistence is essential.

Please join us and join the effort to control the invasion!