Japanese knotweed is an invasive semi-woody perennial plant originating from Japan and Eastern Asia. It is easily distinguished by its broad, heart-shaped leaves and smooth red-purple hollow stems. In Ontario, this invasive plant moves around by root fragments and typically occurs near illegal dumping sites, likely evidence of improper garden waste disposal.
Japanese knotweed is one of the most difficult invasive plants to remove once established, mainly due to its aggressive root system. Its roots are so strong that they have been known to grow through asphalt roads and even damage concrete building foundations. For these reasons and others, timely control efforts are vital to successful eradication efforts.