GALLERY-Plants, Japanese Knotweed Photo Gallery
Information and photos - This plants photo gallery features stock photos of Japanese Knotweed (Fallopia japonica). A large herbaceous perennial plant, native to eastern Asia, Japan, China and Korea. This invasive non-native plant species is spreading rapidly thorough the UK, including England Wales Ireland and Scotland. Surprisingly it's even found in North East Scotland and if it hasn't already done so will likely spread further north. It will grow almost anywhere and particularly likes moist soils this leads to it being very common along riverbanks, spreading vigorously through river courses and catchment areas. These stock photos show the full plant; the leaf; the leaf stem; main stem; and stalk detail. The information and photos could be useful for field based health and safety risk assesments.
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Japanese knotweed (Fallopia japonica) is also known as "fleeceflower", "Hancock's curse", "Elephant ears", "Donkey rhubarb", "Sally Rhubarb", "Huzhang" (Chinese), "Japanese bamboo", "American bamboo", and "Mexican bamboo" The Japanese name is "itadori". (The plant looks similar to Bamboo and Rhubarb but it is not related to either Bamboo or Rhubarb).
Japanese Knotweed is a member of the family Polygonaceae, it has hollow stems with distinct raised nodes that give it the appearance of bamboo. While the stems may reach a height of over 3 metres, smaller plants can be seen sprouting where seeds have fallen. The plant grows freely on waste ground, but because of it's invasive nature it can be found almost anywhere, the plant will force itself through thin or weak coverings of tar (tarmacadam) & concrete and expand cracks in pavements. It is particularly prevalent in river courses, along riverbanks and railway lines. Japanese Knotweed is an oriental plant that was introduced to ornamental gardens and has since spread and naturalised (naturalized) in the UK. Although it provides good cover for some species it can become impenetrable and this non-native plant species is classed as an aggressive weed, nuisance weed, superweed by environmental land managers, county councils, country estate managers, factors and land owners.
According to the Wildlife and Countryside Act Spreading Japanese Knotweed is illegal. The act states that it is an offence under section 14(2) of the Wildlife and Countryside Act 1981 to "plant or otherwise cause to grow in the wild" any plant listed in Schedule 9, Part II of the act.
Ref: Defra, Scottish Executive Environment, Wildflower Society
As it grows Japanese Knotweed forms dense stands of stems that become impenetrable by other plants once well-established. The rapid growth of new shoots and leaves in the spring shades out any vegetation below, suppressing the growth of other plants, including established native species. This non-native invader can cause monocultures to form. Japanese knotweed invasions contribute to reductions in native bio-diversity. This introduced species is harmful to the ecosystem damaging the ecology of sensitive, protected environmental areas taking over precious ecosystem habitat. When the plant infests towns and cities it causes considerable damage to the infrastructure and can take over open ground this leads to high financial costs being spent to eradicate it.
These stock pictures show Japanese Knotweed leaves that are broad pointed teardrop oval shape with a truncated base, the broad leaf teardrop shape leads to a sharp point at the end of the leaf. The flowers are small, creamy white, produced in the later part of summer and early autumn. The Japanese Knotweed plant is sometimes confused with Sorrel. Closely related species include giant knotweed (Fallopia sachalinensis, syn. Polygonum sachalinense) and Russian vine (Fallopia baldschuanica, syn. Polygonum aubertii, Polygonum baldschuanicum).
Species: F. japonica
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Some stock photos of Japanese Knotweed can be found below...