Invasive Plant

Bohemian knotweed

Reynoutria x bohemica
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Warning

All knotweeds species in BC can grow through concrete and asphalt, damaging infrastructure. This can result in significant control, management, and repair costs.

About This Species

Bohemian knotweed is a hybrid between Japanese and Giant knotweed, and resembles both species. Knotweeds were introduced to British Columbia for use in gardens and landscaping due to their rapid growth and attractive appearance. There are now four species established in BC: Bohemian, Giant, Himalayan, and Japanese knotweed. Knotweeds grow aggressively and are very hard to kill. They are widespread throughout the province, and are often found in riparian areas, derelict land, road and railway right of ways and gardens. They thrive in moist soil and full or partial sun. Knotweeds can spread by seed, root fragments, and stem fragments, making them very difficult to control. Knotweeds are considered a noxious weed in BC.

How to Identify

Bohemian knotweed leaves are a blend of both parents- they are slightly longer than wide (about mid way between parents for size) and are typically slightly heart-shaped at the base. In spring, knotweed has plumes of small white to green flowers. Similar to bamboo canes, stems grow tall, straight and densely (at a rapid pace). Stems are green, sometimes with red speckles, and hollow. Stems are generally 1-5 m in height and
may persist through the winter as bare, grey-, or straw-coloured
hollow stalks.

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A few non-invasive alternatives to plant instead of Bohemian knotweed include:

  • Red-osier dogwood (Cornus stolonifera)
  • Black elderberry (Sambucus racemosa var. melanocarpa)
  • Pee Gee hydrangea (Hydrangea paniculata ‘Grandiflora’)
  • False Solomon’s-seal (Maianthemum (Smilacina) racemosum subsp. amplexicaule)
  • Goat’s beard (Aruncus dioicus)

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