Everything you need to know about Japanese Knotweed

You may have already read or heard about this dangerous plant tearing through people’s houses; however, it’s time now to stop and take notice to ensure this problematic plant isn’t eating away at your home right under your nose. Research claims that three-quarters of potential buyers would be put off buying a property if Japanese Knotweed was present, but whether you’re selling or not, to prevent damage to your home or a neighbour’s property, this famous wild plant needs to be tackled immediately.

Ironically, Japanese Knotweed was originally brought to the UK because of its beauty, although it’s now responsible for destroying countless homes, and is costing residents around £150 million a year to get rid of it. In addition to damaging your home, it’s important to know that, as a home owner, you could face prosecution if you allow the plant to grow, and fines if it’s not disposed of correctly. Furthermore, if Japanese Knotweed coming from your property affects your neighbour’s home, they can also make a claim against you for any costs occurred.

How do you know if you’ve got it?

Now is a great time to spot if you have Japanese Knotweed at your home, as it starts growing in early spring and can reach 3 metres long by June, before dying between September to November. You are looking for a plant with red stems and deep green leaves. At first you may spot the red tinged shoots as they break though the ground, and eventually large, green heart-shaped leaves will appear in a zig-zag pattern along the stem. Towards the end of July you may notice clusters of cream flowers appear, which will attract bees. If you’re reading from September onwards, remember that as the plant dies back during this time you need to look out for brown stems.

How will it affect my property?

Growing up to 20cm a day, the weed can cause extensive damage to your home’s foundations, drainage systems, and walls. It can even grow through concrete, and its roots can reach as much as 3 metres deep. But unfortunately the problems don’t end there. If Japanese Knotweed is spotted during a property survey mortgage lenders can refuse to grant your loan until the area affected has been treated by a professional. It can also affect the value of your home, further highlighting the importance of prevention and treatment before you reach this stage. As we have already mentioned, Japanese Knotweed doesn’t just affect your property, if it spreads to your neighbours they can sue for damages – if they can prove that the plant came from your home, you will be liable.

How do I get rid of it?

When it comes to removing the deadly plant you have a few options; dig it out, kill it with chemicals, or smother with tarps. Researching the different techniques for removing Japanese Knotweed yourself could save you thousands. However, do seek professional advice and research carefully to ensure that you carry out the removal thoroughly and correctly.

If you are still unsure if your home has been affected by Japanese Knotweed, you can contact a professional removal company or visit the British Association of Landscape Industries, who have a directory of invasive weed control contractors.

For advice on buying or selling a property that has previously had or is currently experiencing Japanese Knotweed, please contact your local Anthony Pepe branch.