Chinese knotweed is a common name for several plants and may refer to:
Koenigia weyrichii, the Chinese knotweed or Weyrich's knotweed, is a large, perennial, rhizomatous herb native to East Asia.
Persicaria chinensis, commonly known as creeping smartweed or Chinese knotweed, is a plant species from the family Polygonaceae. It is widespread across China, Japan, the Indian Subcontinent, Indonesia, Malaysia, and Vietnam. It is a common plant in Malaysia and Vietnam, where it is used in herbal remedies, such as for the treatment of dysentery, enteritis, and sore throat. It is a weed in some coastal areas of New South Wales and Queensland in Australia.
Reynoutria multiflora is a species of flowering plant in the buckwheat family Polygonaceae. It is known as tuber fleeceflower and Chinese knotweed. It is native to central and southern China.
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