Japanese Knotweed Management Company, Coleraine

Japanese Knotweed Management Company Contact Details

Jim Black
028 7032 1319
07921 073808
5 Cam Road
County Londonderry
BT51 4PX

About Japanese Knotweed Management Company

Impeded by weeds? Tried everything to eradicate them, and still they come back for more? You need the Knotweed Management Company! Established in 2014 and based in Coleraine, the Knotweed Management Company provides proven solutions to remove and treat the triple threat of Japanese Knotweed, Himalayan Balsam, and Giant Hogweed.

Japanese Knotweed
Japanese Knotweed (Fallopia Japonic) is the single most common invasive weed species to be found in Northern Ireland, The Republic of Ireland, and across mainland UK. In the land of its origin, Japan (also China, Korea, and Taiwan), native predators provided an effective buffer to the plant’s spread. Sadly, that is not the case in the UK and Europe. Japanese Knotweed presents a very clear threat to our gardens, buildings, the countryside, and wildlife, with effective identification by the Japanese Knotweed Company your first step towards a successful long-term solution to the problem.

What is Japanese Knotweed and why is it such a threat?
Japanese Knotweed likes nothing better than to invade grounds, gardens, buildings, and roads. Quick spreading and infinitely more stubborn than the proverbial ‘mule’, it has been become the scourge of gardeners and homeowners across the country. Virtually impossible to budge by conventional means, Japanese Knotweed returns again and again, despite best efforts at its eradication. It’s the weed’s ability to spread and regenerate that causes sleepless nights amongst authorities and private individuals charged with dealing with the problem. Early identification and swift action is required to effectively slow, stop, and permanently remove this most intrusive of weeds.

How to spot Japanese Knotweed
So, what does Japanese Knotweed look like? The Japanese Knotweed has a hollow, almost bamboo-like stem with ‘shield’ or ‘heart-shaped’ leaves, often with a pale stripe along the middle. A large plant (growing up to 3m in height) it creates an extensive network of roots (rhizomes) which aid survival during the winter months (when the leafy part of the weed recedes into a brown wasted stem). It only takes a small fragment of this root (finger-nail size) to regenerate.

Himalayan Balsam
If there was a Most Wanted list for plants (or maybe that should be most un-wanted) then Himalayan Balsam would surely be in the top 10. Native to the western reaches of the Himalayas, it was, as with almost all invasive species, originally brought here as a humble garden plant.

Active from spring to autumn, the optimum time to treat Himalayan Balsam is early summer before the plant can seed. Growing in thick ‘stands’ that over-shadow native plants and grasses, it produces a high level of nectar, making it an attractive proposition for bees. This leads to less pollination of native species, and a rapid annexation of the area by Himalayan Balsam. From October, the Himalayan Balsam’s presence reduces, leaving soil exposed to erosion in the absence of the native species.

Himalayan Balsam is also known as Indian Balsam, Jumping Jack, and Policeman’s Helmet, and its natural habitat is gardens, allotments, river banks, and brownfield sites.

How to control Himalayan Balsam
Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. There are traditionally two methods of dealing with Himalayan Balsam, Non-Chemical and Chemical. The former is the option of choice for most, involving the pulling or cutting of plants before they have a chance to flower. In many cases, however, digging is required for a minimum of two years as seeds are sustainable for that period of time.

If Non-Chemical control is not possible, chemical treatments can be used (following permission from The Environment Agency is used on riverbanks).

Giant Hogweed
Found in every corner of the British Isles, Giant Hogweed (Heracleum Mantegazzianum) is not only invasive, but potentially extremely harmful. A native species of Asia, the Giant Hogweed is now prevalent in North America and Europe. More than 16-feet tall when in flower (hence the ‘Giant’ moniker) it colonises wasteland and river banks, produces between 30,000 and 50,000 viable seeds per annum, and can cause painful rashes and other skin complaints.

What are the dangers of Giant Hogweed?
It’s fair to say that humans and Giant Hogweed don’t see eye-to-eye. This invasive species can cause severe burns to the skin and, if the sap toxins come into contact with eyes, even has the potential to blind. In short, it’s a public health hazard.

How to control and eliminate Giant Hogweed
Giant Hogweed seeds can remain dormant for up to ten-years, making total eradication all the more difficult. Add in the large amounts of seeds produced (30,000 to 50,000 per plant) and you begin to see the scale of the problem. In order to be effective, treatment should be undertaken on an annual basis, with early spring until the start of summer the best time).

So, what forms of control and treatment are available? As with Himalayan Balsam, there are two courses of action…Non-Chemical and Chemical.

Non-chemical controls:
  • Non chemical controls in a garden environment include pulling up young plants by hand in May when the Giant Hogweed has reached a manageable height, yet before the flower has faded. The main message here is: NEVER, NEVER let hogweed seed!
  • It might appear to have eradicated the problem, but cutting is NOT a long-term solution.
  • On a greater scale, mechanical excavation is recommended. However, you must take the Giant Hogweed’s ‘seed bank’ into consideration.

Chemical control:
Chemical controls can be implemented, but in the case of river banks Environment Agency approval must be secured.

Location Map of Japanese Knotweed Management Company