Elcot Environmental are Japanese Knotweed experts with over 38 years experience in the invasive weeds field. We help building contractors, large industrial sites and domestic homeowners understand the problem with invasive weeds while providing an effective range of treatments backed by a guarantee. Commercial Site Clearance With over 38 years experience on large-scale commercial site clearance projects, our highly experienced team of specialists are capable of tackling jobs of all sizes and complexities.