Japanese Knotweed is a strong-growing, clump-forming perennial, with tall, dense annual stems.
Stem growth is renewed each year from the stout, deeply-penetrating rhizomes (creeping underground stems). It is widespread around Salford appearing on waste ground, along watercourses and areas of previous tipping.
It is classed as an invasive species of plant, and is considered a particular problem as it can block footpaths and damage concrete, tarmac, flood defences and the stability of river banks.
Japanese Knotweed does not spread from seeds in the UK. It is spread when small pieces of the plant or rhizomes (underground root-like stems) are broken off. One piece of rhizome or plant the size of a fingernail can produce a new plant.
Pieces of plant or rhizome can be transported to a new location by:
Individual plants can cover several square metres of land, joined up below ground by an extensive rhizome network.
On your property, you should aim to control this plant and, to prevent it becoming a problem in your neighbourhood. If it does have a detrimental effect of a persistent or continuing nature on the quality of life of those in the locality new legislation could be used to enforce its control.
Control can be carried out by the homeowner (download a guidance sheet below) and doesn't require a specialist company. However, a specialist company will be skilled at control and can dispose of the plant waste.
Large stands of knotweed or knotweed on development sites require specialist treatment.
On no account should Japanese Knotweed be included with normal household waste or put out in green waste collection schemes.
Where problems with Japanese Knotweed occur in neighbouring gardens, we suggest that you speak or correspond directly with your neighbours (who may already be taking action to control this difficult weed).
If you are concerned about Japanese Knotweed on land in Salford let us know. Where it is on land owned by the council, we will include it in our treatment programme. If it is not on council land, we will endeavour to inform the relevant land owner.
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This page was last updated on 31 May 2016