Knotweed Terror: Blackburn Overrun by Invasive Plant

Blackburn and Darwen are grappling with a severe infestation of Japanese knotweed, an invasive plant introduced by Victorians. This aggressive species can grow up to 10ft tall and three metres wide in a single season. Experts advise that common methods like mowing are ineffective and can spread the plant, while direct injection of weedkiller into mature stalks is considered most effective.

Specialists at Environet have identified Blackburn with Darwen as the UK's most affected borough, based on extensive data from their online tracker. The plant's rapid growth and difficulty in removal pose significant challenges for homeowners, impacting property sales and potentially leading to legal disputes with neighbours if it encroaches on adjacent land.

Local residents are increasingly concerned about the plant's proximity to their homes and potential impact on property foundations, especially given its ability to grow through concrete. The council acknowledges the issue, stating that knotweed on public land is actively managed through targeted treatment programmes, though eradication requires persistent, long-term efforts.

The plant, scientifically known as Polygonum cuspidatum, is also a commercial source for resveratrol, a compound with high antioxidant properties. However, its invasive nature and the difficulties associated with its removal are the primary concerns for residents and property owners in the affected areas.