The treatment of knotweed is extremely specific and requires a tailored treatment plant depending on the age of the weed, the depth on the rhizomes and volume of the weed. Following a survey from our surveyors, who are Certified Surveyors of Japanese knotweed (CSJK), a treatment plan is put in to place and a decision is made on if the knotweed requires excavating, spraying with chemicals, or burning.