This weed is considered to be one of the most invasive and damaging species ever introduced in to the UK, affecting many different rural and urban areas. Because of its growth habit and ability to spread rapidly, it quickly out-competes native UK vegetation, reducing the biodiversity of the landscape.
Japanese knotweed can grow in very hostile conditions, often growing through tarmac and concrete, knocking walls over and penetrating the foundations of buildings, leading to expensive damage. During late autumn and winter, the leaves fall leaving behind unsightly stems that trap litter. This causes a health risk by attracting vermin.
Japanese knotweed, mugwort and other woody species can be controlled with products containing the active ingredient picloram, such as Tordon* 22K. Picloram has both foliar and residual action, and is safe to grasses. The use of Tordon 22K to control Japanese knotweed can quickly lead to increased biodiversity, as native grass species recolonise treated areas as soon as the weeds have died back. Broad-leaved species of desirable plants can naturally recolonise treated areas in subsequent years after application.
Biodiversity improved - 1 year after application of Tordon 22K.
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