Japanese knotweed is a very invasive and persistent perennial plant, spreading rapidly by the rhizomes (creeping underground stems) to form dense colonies. It can invade and grow on a wide range of habitats, including riparian areas, wetlands, and disturbed areas such as rights-of-way. It is very tolerant of deep shade, high temperatures, and soil salinity. It also thrives in urban and semi-urban areas.

Infestations can cause serious damage to buildings, roads, railways, and other infrastructure. Its roots can cause cracking and separation of structures such as paving slabs and concrete, as well as heave the surface of buildings and their foundations. It can even grow through gaps in walls, doors, and windows. It can also spread from garden to garden, and even intrude into neighbouring properties, so it’s important to seek the help of a japanese knotweed specialist near me as soon as you notice an infestation.

The plant is also an environmental hazard, degrading natural habitats and disrupting ecosystems, including wildlife corridors. It can compete with native plants for resources and crowd out other species. It is also known to have toxic effects on humans, animals, and other plants.

If left untreated, the weed can take over your entire garden. Its rapid growth can block out sunlight to your other plants and reduce your garden’s value. It can also spread into neighbouring gardens and impact on the drainage system and structural integrity of your property, leading to costly repairs and disruption to your home.

Thankfully, there are several ways to control the problem, although it isn’t always easy. The key is to eradicate the rhizomes, which are the plant’s creeping underground stems that give rise to new shoots and roots. This can be done by a professional – they will be able to draw up risk reports and offer treatment plans with guarantees on complete eradication, which mortgage lenders are usually happy to accept.

Chemical treatments are the most effective, but can be costly and need to be repeated regularly. Glyphosate, the active ingredient in Roundup, is a commonly used herbicide but it has been linked to cancer and may have negative impacts on aquatic life and the gut bacteria of pollinating bees. Similarly, triclopyr herbicides can be used but should only be applied close to water and with care.

In more severe cases, excavation and removal may be necessary. In such cases, the weed is considered to be controlled waste under the Environmental Protection Act 1990 and must be dealt with appropriately. It is not suitable for adding to your home-compost or council-run garden waste bins, so you will need to dispose of it at a licensed landfill site.

It isn’t illegal to have Japanese knotweed in your garden, but it is against the law to allow it to spread into wild or neighbouring gardens. It’s therefore crucial to seek the help of a japanese Knotweed specialist, as early action can prevent the weed from becoming a significant issue and potentially affect your ability to sell your property in future.