Cook Group Ltd
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Identifying Japanese Knotweed

Japanese knotweed

Japanese knotweed is identified by several unique characteristics

  • Tall, arching and hollow bamboo like canes or stems that usually arch or lean over 
  • The stems can be covered in purple speckles and up to 3 metres in height
  • Mature stems can be a brown/purple colour, particularly later in the 'season'
  • Large green spear shaped leaves
  • The leaves grow on the stems in a zig zag or alternate pattern
  • The plant dies back in winter leaving brittle brown stems
  • The root system or rhyzomes are orangey & yellowy inside and are brittle when snapped

Early growth during April - May

        

 These young shoots can grow at a rate of 75mm per day! under ideal conditions

Tall Canes or Stems

 The higher they get the more they arch over.

Japanese Knotweed Control in yorkshire

 

Speckled Stems 

See the purple speckles on the stem

Japanes Knotweed Cane close up

Large Green Spear Shaped Leaves 

Note the leaves growing in a zig zag or alternate pattern along the stem

 Japanese Knotweed Leaves Close Up

 

Dead Canes during winter months

Japanese knotweed Canes

 

Identifying Japanese knotweed video

We make no promises for the quality of this video footage, it was quite literally taken from one of our surveyors site notes!

It does however give you some 'real time' evidence of what Japanese knotweed looks like between May & August

 

 

 

Todays Featured Images
Todays featured Gallery Images

Wharf borer larva
Another close up of a larva outside his house
Wharf borer larva

small-basement(1).jpg
Work in progress, the chalk walls here are to be repointed using a limemortar
small-basement(1).jpg


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