Following the initial discovery of Japanese knotweed on the Downs, Mads and Will surveyed the area on Saturday 17 July and found a few more areas of growth.


Above is a map of the knotweed, marked in red, that has been found.  Further down this post are some of pictures to help identify it.  It would be really helpful if everyone could keep eyes open. It is an imported and extremely invasive plant…you do not want this in your garden. It doesn't seed itself - it is spread through tramping it when walking and there are now some outbreaks close to paths. (Please note that a patch on the outside of the dwarf wall around The Clump turned out not to be knotweed - apparently, it is a "bushy shrub!")

Martin Andrews of the Vale of Glamorgan Council has visited the common with Will and found knotweed in the scrubland opposite the gates to the radio masts.  He has engaged contractors in to deal with this after it flowers in September.  Martin has recorded the position of the other growths and is going to look at the land records to see if it is council land. If it is council responsibility, he will arrange for contractors to start treatment.


The photograph below is of the enormous growth on the left of the middle of the left hand paths from the track from the village as it emerges onto the Down.

JKdowns Copy

Here is an example sprouting close to a path - please mind your steps if possible.


Japanese knotweed can sprout from very small sections of rhizomes so be wary of approaching the plant as it spreads from the pieces of its green stem and contact might result in transfer to the village – it is an offence to cause Japanese knotweed to grow in the wild. Here is information about Japanese knotweed from the RHS: 

Japanese knotweed has a characteristic red stem with leaf shoots that are staggered, not parallel.


Please contact us, using the link at the top of the page, if you see or know of any other patches (the outbreak down the St Mary Church lane is being treated by the Council) and we will coordinate the responses.