Japanese Knotweed growth may just dominate gardens up and down the country due to the frosty start to the year which may have killed off other plants, the knotweed competitors! In the winter Japanese knotweed lies dormant yet recharging its batteries in preparation to raise its ugly head when the warmer weather starts. Japanese Knotweed will dominate this year! Japanese Knotweed removal can begin this season, lets take back control of your garden.