Knotweed: what you can advise for eradication

Getting rid of knotweed is extremely challenging, which is why it is such a persistent issue in the UK. Recently, antisocial behaviour orders were implemented for anyone who doesn’t handle invasive species appropriately.

This includes Rhododendron Ponticum and Giant Hogweed. Now that these orders are in place, it is more essential than ever to learn the proper technique for handling species like these.

Some of the most common treatments include the following:

Herbicides. Popular application methods include spraying, using a weed wiper, or injecting the herbicide into the stem.

These products are most effective when they are applied late in the summer when the plant is flowering. Anyone involved in the spraying process should be qualified to safely handle both the spray applicator and the herbicide. The instructions printed on the label of the herbicide must be followed precisely.

Excavation. The roots and the aboveground portions of the plants can be treated simultaneously after they are excavated according to Environet. Once the plants have been removed from the ground and sprayed with herbicide, they can then be burned. This minimizes the volume of waste. Placing the plants in a bund during treatment increases the efficacy of the herbicide by encouraging plant growth.

Burying the plants on-site. This technique can be used on its own or along with herbicides. Once the knotweed has been excavated, it can be buried. To prevent future growth, a plant-resistant membrane should be used. If no membrane is available, the weeds should be buried deeper than 5m.

Disposing of the plants off-site. Although this is usually the fastest option, it also costs more than some of the other treatment methods. With this technique, both the knotweed and the soil surrounding it are transported to a special facility that is licensed to dispose of weeds like these. When the knotweed is excavated, all of the viable parts of the plant must be removed. To accomplish this, a large area needs to be excavated.

Containing Japanese Knotweed

While treating existing knotweed is important, it is also essential to keep it from spreading further. Set up fences around the area where you are working, leaving just a single entrance for vehicles. Have power washers on-site to clean vehicles, getting rid of any dirt or plant material that has become embedded in the wheels or tracks before the vehicles leave the site. Workers should clean their clothing, using a brush to eliminate any dirt. Any items that enter the containment area need to be thoroughly cleaned and properly handled to keep the weeds from spreading.


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