Fallopia japonica, Japanese Knotweed

Fallopia japonica is a large herbaceous plant native to Asia. In Europe it grows vigorously and is classified as an invasive species in several countries. This Fallopia japonica grows on the embankments of a stream in Mersey Valley in Manchester. It has spread very fast on both sides of the stream and because of its hardly reachable location it is very difficult to be completely removed. The plant has already invaded the water channel threatening to cause some serious problems in the future. It thrives extremely well in wet soils. Its broad oval leaves can cast deep shade thus not allowing anything to grow underneath it. The plant can grow in full sun or shade exposure. It has such a strong root system that it can damage concrete foundations and buildings. It can also seriously affect the biodiversity of the area as well as flooding management. It has been classified as one of the world’s worst invasive species.