What Does Japanese Knotweed Look Like?

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Introduced to the United States in the 1800s, the Japanese knotweed is an invasive perennial shrub-like plant native to eastern Asia. Its common names include Mexican bamboo, fleeceflower and huzhang.

Height

  • Japanese knotweed generally grows three to nine feet in height. Sometimes it grows over 10 feet in height.

Stems

  • The stems of the Japanese knotweed are red, hollow, stout, smooth and jointed. At the joints connecting the stems with the leaves, the stems are swollen.

Leaves

  • Leaves of the Japanese knotweed are pointed at the tip, feature reddish veins and range from triangular to oval in shape. They average six inches in length and three to four inches in width.

Roots

  • The roots of the Japanese knotweed are usually 15 to 18 feet long and they are also thick. The roots are the primary way the Japanese knotweed spreads.

Flowers

  • Japanese knotweed flowers are small and range in color from white to green-white. They bloom in late summer, and grow in branching sprays near the outer part of the stems.

Seeds

  • After the flowers bloom, the Japanese knotweed produces black winged fruits, with shiny seeds that are triangular and one-tenth of an inch long.

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