Sunday 13 December 2015

Week 1: Fallopia Japonica; Japanese Knotweed.









pH 7.5 - ALKALINE

Common Name: Japanese Knotweed

Latin Name: Fallopia Japonica

Type: Perennial

Location: Oldham, Manchester. 

Ultimate height: Up to 2m

Located Fallopia Japonica height: 400mm 

Leaf Shape: Large triangular deltoid shape leaves distributed on bamboo like red cane stems

Bark: No bark, stems are bamboo like and vary in colour from red, brown to green.

Fruit/Flowers: Fruit has a papery texture. Flowers are of a whitish colour, pendulous spikes grow from base of the leaf between August and October. 

Distribution: Japanese Knotweed is rare throughout the UK, however it does colonise on wayside areas.



I located this specie on a brownfield site, specifically within a mound of rubble. It was of a young age and had managed to grow through the stone, brick and soil heap. Fallopian Japonica has a reputation of being able to grow in almost any conditions, especially wastelands and brownfield sites like the one displayed above. It is very difficult to permanently remove the weed, as you have to use chemical killer to penetrate its root system. Chopping of its stem above ground cannot be regarded as a temporary measure, as it is only a means of prolonging its growth.  

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