Common reed is extremely detrimental to native plants and wildlife. It can rapidly form dense stands of thams that crowd out or shade native vegetation in inland or estuary wetland areas. These plants can turn diverse habitats into monocultures lacking biodiversity that is needed to support a thriving ecosystem. They can alter marsh hydrology, decrease salinity in brackish wetlands, change local topography, increase fire potential and outcompete native plants. extremely difficult to eradicate and tends to emerge earlier in the season than native plants. It is less susceptible to insect herbivory than native plants as well.