Japanese knotweed leaves can be nearly 6 inches long and also have a squared leaf base. Huge or hybrid knotweed leaves will expand much bigger, approximately 1 foot long, and also have a rounded leaf base. Although It's not at all mandatory to report Japanese knotweed which is growing on https://funny-lists.com/story21618096/the-2-minute-rule-for-japanese-knotweed-specialist-weed-control