What type of environment is knotweed an indicator of?

Knotweed is an indicator of compact places because it thrives in areas where the soil has been disturbed, often resulting in compaction. This plant is highly adaptable and can grow in various conditions, but it is particularly prominent in locations where human activity has led to soil disruption, such as construction sites or heavily trafficked paths. Compacted soils create conditions that favor knotweed, allowing it to outcompete other vegetation and establish a strong presence. This characteristic makes knotweed a useful plant for assessing soil conditions and disturbances in the environment.