Invasive & Noxious Species


Non-native species are those that occur outside their natural range due to direct or indirect introduction by humans.  If the introduced plants or animals persist in natural or unmanaged habitats, they are termed ‘naturalised’.  Many naturalised species do not present a problem but some that spread and outcompete native species can threaten ecosystems, habitats or native species – resulting in environmental or economic damage.  These are considered to be invasive either due to lack of natural control mechanisms (such as predators), rapid rate of spread (by seed or vegetatively) or suppression of other species (such as allelopathy – as with black walnut – or competition for resources).  There are many Invasive & Noxious weeds in Ireland and the UK, and once identified can be managed in numerous different ways depending on the specific situation.  Care needs to be taken on chemical selection, application method and choosing the most suitable time to treat which is different for every situation.  Greentown Environmental Ltd have over 50 years experience which provides extensive experience in management of all the weeds below. 


 Greentown Environmental Ltd. are specialists in the treatment and management of Japanese Knotweed.

We offer a wide range of treatment plans and insurance backed supervisory service where required.  We currently provide Japanese Knotweed treatment to a number of councils including Kerry County Council, Donegal County Council, Galway County Council, Sligo County Council & Roscommon County Council.

To request a Site Survey please Click Here

For more information on our sister company Knotweed NI click here to view our brochure

Japanese Knotweed... A Growing Concern


JKW can cause significant damage to construction work and has the power to grow through tarmac, paving stones, brickwork and cement. If left untouched JKW will out compete and smother are native species. The plant’s leaf canopy of broad leaves obstructs light to the ground preventing natural flora and fauna from growing. Dead vegetation decomposes slowly over a number of years and also obstructs light. It also creates a fire risk during the Summer months and during dry periods. The plant can survive extreme heat and is found in volcanic areas within its natural habitat so burning JKW will not eradicate it. All it takes is is a piece of rhizome less then 0.7g to grow a new plant.