Japanese Knotweed House

ByIgor Molchan

Japanese Knotweed House

If you have a Japanese knotweed house, meaning Japanese knotweed on your property you can call us. After receiving a copy of our terms and conditions we can usually do a survey for you the same day, depending on workload and location. We will then establish the extent of the problem and provide you with an electronic copy of the survey report within 24 hours of our site visit. If required we can also provide you with a copy of the management plan, this will have our treatment recommendations for eradicating the Japanese knotweed. We can then apply for a 10-year insurance backed guarantee, all of this will then satisfy your buyer’s mortgage company.

There are a lot of negative connotations in the press when it comes to Japanese Knotweed. There are however several positives to it, some of which we will explore below.

You may be very interested to know that Japanese knotweed has some very interesting uses, I have been out to sites were badgers have made a Japanese knotweed house. When I say Japanese knotweed house, I mean the knotweed is covering the set where they live.

One particular Badger set I visited was massive, the Badgers had built a Japanese knotweed house into a large sand mound. I was told the set had been there for over fifty years it was covered with very dense Japanese knotweed. I would say I noted around eight holes and many well-treaded pathways through the knotweed. If you think a badger’s lifespan is around 8 years there must have been many generations that have used the Japanese knotweed house.

Like most wild animals, Badgers are very shy and like to move around and forage for worms, snails and slugs under the cover of the Japanese knotweed. It’s great for giving the badgers and their young the privacy they like, you are more likely to see the animals at dusk when they are surrounded by Japanese knotweed.

Foxes also like to make a Japanese knotweed house, they like to build their dens in between the dense crowns of the Japanese knotweed. Unfortunately, both the fox and the badger have fur that is barb-like and ideal for carrying the small fragments of Rhizome, aiding the nation widespread of the plant.

On the majority of surveys under reasons for contamination, it’s mentioned that the fox or badger is probably responsible for spreading the plant onto the client’s land.

Up in the highlands of Scotland, there are areas of Japanese knotweed that are protected by law and are not allowed to be treated due to otters using the Japanese knotweed as their pathways between ponds and rivers. So, you could say that the otters are using the plant as a Japanese Knotweed house also.

When treating larger stands of Japanese knotweed, we would normally tend to treat later in the day as there are lots of bugs that make a Japanese knotweed house to hide from birds and other predators. The creamy flowers that are produced in late summer are nectar-rich and bees and butterflies love them.

We have also found many types of insects like earwigs millipedes & woodlice who also make a Japanese knotweed house in the dead canes and the crowns of the plant.

Alongside areas that are wet, you would tend to find lots of frogs and newts. They tend to like to make a Japanese knotweed house under the decaying leaves, the damp leaves provide a lovely damp environment for them to live and hide away from predators like Adders.

Beavers have been known, to use Japanese knotweed to build a Japanese knotweed house on the river, they weave the canes into their dams and they eat the leaves. This is not surprising, as apparently, the plant has a similar taste to rhubarb. The major downside again is that it is very likely that fragments of Rhizome will be washed downstream to contaminating new areas.

Please check out this interesting link below to Scottish invasive web site:


So, as we have seen there are many positives regarding Japanese knotweed. There are many animals that greatly benefit from the invasive species, it benefits them as they can make a Japanese knotweed house and hide amounts the foliage of the plant.

Unfortunately, in a lot of areas were this plant decides to grow it becomes a nuisance. It tends to compete for space with our native species, altering the ecology of the area. This could mean that plants and animals that would normally live in the area will be lost or move on.

The reasons that mortgage companies are concerned, when leading money on a property that has Japanese knotweed, is that they know that if the plant is not treated correctly, there is a strong chance that it could go into dormancy for up to 10 years. This would mean that their investment is not safe resulting in the property being sold at auction in the future for significantly less than the loaned amount.

The building society will normally issue a mortgage if the following criteria are met:

You use a ‘Property Care Associated’ accredited contractor to carry out the works.

There will need to be a detailed survey carried out on your property, to establish if treatment is required and the best course of action.

A management plan will need to be in place, this will show our recommended treatment course. The management plan will need to be updated and sent to you after every visit. This will show photographic evidence, that the agreed work is being carried out as specified in the management plan.

In most cases, a 10-year insurance backed guarantee is required. The guarantee is required, in case the contractor goes out of business. Should our company cease trading, within the specified treatment period, the insurance policy will pay out. This will pay for another qualified Japanese Knotweed company to step in and complete the work, at no extra cost to you or the person living in the property.

Never use a company that is not qualified to do the work, always ask to see copies of their qualifications if you are unsure. if the person or company is not qualified, the mortgage company will not lend the money to the property.

Have you read our article on what Japanese Knotweed is?

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Igor Molchan administrator