Several reports say experts are issuing urgent warnings about Japanese knotweed, sometimes described as a “bombsite plant,” because of its potential to damage buildings. The accounts focus on how the plant’s aggressive growth can affect household structures over time. They state that knotweed can force apart or destabilize features including brickwork, chimneys, and roofs, due to the pressure it exerts as it spreads. The articles frame the risk as something homeowners should take seriously, noting that the plant is little-known to some residents and can cause significant structural problems if established near properties. While the sources emphasize the harms visible in and around homes, they do not provide detailed methodology, timelines, or specific case studies in the excerpts provided. Across the coverage, the central message remains that Japanese knotweed is a persistent growth that can lead to costly building damage, prompting calls for early recognition and appropriate action to prevent or limit its spread.