Chinese knotgrass (Polygonum multiflorum) is a perennial climbing plant. In the West, it is often grown as an ornamental. In the East, Chinese knotgrass is more often grown as an herb used to treat a number of ailments. Whatever the reason, those who plant Chinese knotgrass quickly discover its spreading capabilities. Luckily, removal of this plant is easy. The key is to uproot the plant's tuberous root. If left in the ground, it is capable of regeneration. And it is quite large, making it resistant to spray herbicides.
Use lopping shears to cut back as much of the Chinese knotweed's foliage as possible. If possible, do this before fall when the plant flowers and sets seed.
Dig out Chinese knotweed's roots. Chinese knotgrass has a large, tuberous root. Dig the main root and any adjacent, smaller pieces with a shovel. Be sure to get all of the roots to prevent the Chinese knotgrass from growing back in the same spot.
Monitor your yard for regrowth. If the stand of Chinese knotgrass is large and spread out, you are likely to miss a few root pieces or seeds. Dig any seedlings that you spot immediately.