September’s weed of the month is giant knotweed (Polygonum sachalinense). Giant knotweed has hollow, bamboo-like stems and grows over 12 feet tall, making it the largest of the invasive knotweeds. It ...

Japanese knotweed looks quite pretty when it’s in full bloom in late summer to early fall. But it’s actually a fast-growing invasive perennial weed that can take over your landscape in a hurry. “It ...

This may be one pest you can’t weed out. An invasive, non-native plant species has grown root and spread, posing a threat to manicured yards and even home foundations across the American Midwest, ...

Giant knotweed (Polygonum sachalinense) is a semi-woody shrub-like perennial that is native to Asia. It was originally introduced into the U.S. as an ornamental, but it has proven to be an extremely ...

The herbicide glyphosate, touted as the most effective treatment for controlling knotweed, is one of the most well-studied chemicals, experts say. Scientific data does not support claims that ...

For a highly invasive plant, Japanese knotweed looks unassuming. With green bamboo-like stems, spade- or heart-shaped leaves and, in late summer, clusters of white or pale green flowers, Japanese ...

Call it knotweed, or Japanese bamboo, or Reynoutria japonica, it’s all the same plant. Easy to identify, it is a big perennial herb that grows as a shrub up to eight feet tall. It dies back to the ...