👉 Higan is a type of plant in the family Fabaceae, commonly known as the Japanese knotweed or common knapseed. It grows in moist areas and can grow up to 30 feet tall. Its leaves are typically green and have white spots that resemble knots, making it look like an umbrella. Higan is often found along streams, rivers, and lakes where it feeds on aquatic plants, causing damage to aquatic ecosystems.