Fallopia is a genus of flowering plants in the family Polygonaceae. It includes several species, commonly known as knotweeds, which are characterized by their climbing or sprawling growth habits. These plants are often found in temperate regions and can thrive in various soil types. Some species of Fallopia, such as Japanese knotweed (Fallopia japonica), are known for their invasive nature, spreading rapidly and outcompeting native vegetation. They can pose challenges for land management and conservation efforts due to their resilience and ability to grow in disturbed areas.