Japanese Knotweed Identification

Japanese Knotweed is a highly invasive plant which can grow at speeds of 10cm a day. Its emerging shoots can quickly exploit weaknesses in brick, tarmac, and metal piping, causing costly damage to everything from buildings to roads, causing severe damage to building and garden structures.

How to identify Japanese Knotweed

Japanese Knotweed photos

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Still unsure if you have knotweed? Japanese Knotweed can easily be commonly mistaken for other plants and it may not be obvious to you at first glance. So if you are still unsure how to recognise Japanese Knotweed, simply send us a photo and we will tell you if we believe you to have it.

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Japanese Knotweed identification guide

Why remove Japanese Knotweed?

Japanese Knotweed’s destructive nature can result in costly damage to buildings and garden structures as well as preventing progress on projects and hindering house sales. Its ability to exploit existing weaknesses in properties as well as underground systems, walls and building foundations mean repair work can range into the thousands. With its advanced root network, the rhizomes grow through any structure. Your mortgage and house price can also suffer.

Can I remove Japanese Knotweed myself?

Japanese Knotweed can re-grow from cuttings as small as 2mm, meaning the smallest traces can lead to new growth. Because of this, Knotweed is classed as controlled waste and must be disposed of safely at a licensed landfill site according to the Environmental Protection Act (Duty of Care) Regulations 1991. This is why removal should be carried out by licensed professional Japanese Knotweed removal experts.

The plant’s widespread rhizome network that could be around 2m deep and 7m in other directions, beneath the ground is still alive and will begin growing Japanese Knotweed shoots again in spring.

It’s important to look out for specific characteristics for each season to know how to identify Japanese Knotweed to prevent unnecessary hold ups on buying or selling your home, or any commercial building projects. We’ve put together some Japanese Knotweed photos in our gallery above showing its various stages of growth.

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