Title: Fallopia japonica Date: 06-09-2018 Tags: invasive, plant, garden, structure, root Location: WTC Mood: still tired Image: 18000-nockweed-in-house.svg 00022 Originally from Japan and once a specie popular for its beauty and rapid growth, it is classified today as an invasive plant. Knot weed can damage foundations and pavements and it is very difficult to control or eradicate due its powerful roots.