Japanese knotweed
Polygonum japonicum
Family: Polygonaceae
What it is like
A herb. It grows 50 cm tall. The leaves are 10 cm long by 2 cm wide.
There are about 50 Polygonum species.
Where it is found
It is a temperate plant. In Vietnam it grows at 700 m above sea level.
Countries/locations it is found in
Asia, Britain, China, Europe, Indochina, Japan, SE Asia, Vietnam
How it is used for food
Edible parts
Leaves, root, seeds, stem
How it is grown
Its other names
Local names
Nghe hoa-to
Synonyms
Persicaria japonica (Meisn.) H. Gross ex Nakai; Polygonum macranthum Meisn.; Polygonum martini H. Lev. & Vaniot;