Japanese knotweed

Persicaria capitata
Herb
Alternate
Simple
White
Pink
Variegated
Green
Purple
Common names 
Also known as: Japanese knotweed, knotweed, persicaria, pink-head knotweed, pinkhead knotweed, pinkhead smartweed,
Family 
Polygonaceae
Deciduous 
No
Flowering time 
Spring
Native/Exotic 
Exotic
Origin 
Native to China, the Indian Sub-continent and south-eastern Asia.
Notifiable 
No
Council declaration 
SIL – Special Investigation List
Known distribution 

This species is becoming widely naturalised in southern and eastern Australia. It is currently naturalised in south-eastern Queensland, in the coastal and sub-coastal districts of northern and central New South Wales and in the coastal districts of south-western Western Australia. It is also sparingly naturalised in south-eastern South Australia. Naturalised overseas in the USA (i.e. California, Oregon and Louisiana), New Zealand, La Réunion and Hawaii.

Impact and control methods