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Invasive Species - Knotweed Control

Japanese Knotweed (Fallopia japonica) – an invasive species, no natural enemies in our ecosystem so easily outcompetes our natural flora. It does very well in coastal damp places and is having a real impact on the scenic value in places like Loch Fyne & Loch Gilp).


There are patches around the Craignish peninsular and following concerns raised at the C3 AGM, Craignish Community Company has instituted a programme to eliminate Japanese Knotweed on the Craignish Peninsula. We are doing this under C3’s environmental remit.

It will involve treating the Knotweed in August for a minimum of four years.

A licensed and specifically trained person will undertake the work. This is done by injecting a herbicide into the stems rather than spraying, which can also impact surrounding plants. This uses the minimum amount of herbicide.


Where is it? We are aware of a number of patches on the Loch Craignish foreshore, but there will certainly be others. Attached is a map showing the locations that we know about.


We would love to know of any other locations – so if you know of any patches please email/pm me with a location (describe where or a grid reference/lat and long, whatever is easy.)

If you are not sure, tell us anyway and we’ll check it out.


Here’s a guide  - http://www.nonnativespecies.org/factsheet/factsheet.cfm?speciesId=1495

Here’s a Map showing what we know about


If anyone would like to get involved in this, in helping locate and map where it is, please say, we’d be very grateful for any assistance


C3 has so far raised the funds to cover the training expense and estimates that the annual treatment will cost in the region of £1,000, depending on how much Knotweed is discovered. C3 is currently researching external funding sources but does not expect this to cover the full amount required, so if anyone would like to chip in a few pounds to our knotweed fund, please be in touch.


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