Does Japanese Knotweed Cause subsidence

Does Japanese knotweed cause subsidence? Actually, yes. The most common question about Japanese knotweed is whether or not it will cause subsidence or it will damage your property.

Knotweed can cause both, depending on how it grows. The stemless, underground stems can grow up to thirty feet tall, so they can reach your roof if they break through the surface. But they will not actually move a large amount of soil, since they are not roots.

Even if they did move some soil away, it would only be a very small amount and it would quickly be replaced.

A better understanding

Japanese knotweed is an invasive weed that can cause subsidence. It causes this damage by pulling on the ground and pushing it downwards, causing cracks in the foundation of a building or home.

This plant is hard to get rid of because it spreads through spores and will take over if not controlled.

The spread of Japanese knotweed is attributed to its ability to grow very quickly even when there are only tiny fragments left behind after being cut down or pulled up.

So, why do some people claim that knotweed can and will cause subsidence in your home? That comes down to how you interpret “subsidence” itself.

You might as well not mention it to your mortgage company, because they likely won’t let you talk about it. They don’t want to deal with it.

Your bank doesn’t want to deal with it, either, since it can lead to expensive and complicated repairs that they would have to pay for out of their own pocket, and they don’t want to be liable for the resulting lawsuits that result from your mortgage providing grounds for such damage.

Can Japanese knotweed cause subsidence to a building
Can Japanese knotweed cause subsidence to a building

So what does “subsidence” mean, anyway?

It’s an old-fashioned term that describes any unexpected movement in a structure’s foundation, usually caused by some kind of physical event like a massive ocean wave or ground collapsing.

Usually, this kind of incident causes major damage to homes and businesses, but sometimes it doesn’t.

Whatever the case, though, you shouldn’t be worried if you suspect that your home could be at risk. There are measures that you can take to make sure that it doesn’t cause your mortgage lender to take the traditional route of foreclosing and removing your home from your possession.

Broken pipe due to subsidence in the soil around the house.
Broken pipe due to subsidence in the soil around the house.

Final thoughts

Japanese Knotweed is a fast-growing plant with the ability to cause subsidence. In fact, it can grow up to one foot per day and produce more than 1 million seeds in just two months! Watch out for this invasive species as you move through your yard outside of work.

You should also plan on regular check-ups of the ground for any signs of subsidence, as well as of the foundation of your home in general.

Remember: Prevention is far better than cure, so the sooner you can stop the Japanese knotweed from causing subsidence in your property, the better.

Want to know if Japanese Knotweed causes subsidence?

Knotweed Removal aims to provide the most up-to-date information, help and advice for YOU to make informed decisions. If you are unsure or uncertain about how to proceed, please reach out to us and we will gladly come back and advise you as best we can.

Governmental advice can be found here and the UK law covering the removal of Japanese Knotweed as stated under the Wildlife and Countryside Act 1981 can be found here.

The best means to contact us is via our email – hello@knotweedremoval.tips

Do not forget we have a library of blogs covering many areas relevant to Japanese Knotweed, our free downloadable How-to Guides and Product Reviews on the latest methods being employed to eradicate or remove Japanese Knotweed.

Knotweed Removal, UK

Bestseller No. 1
Bayer Garden 2 x Path, Patio & Drive Weed Killer & Watering Can Set - 3 x 8g Sachets per pack treats upto 75sqm - Kills Ground Elder, Nettles, Docks, Couch Grass & Japanese Knotweed.
  • This exclusive twin pack and 9L Watering Set is everything you need for clearing weeds from paths, patios and rives including areas of tarmac, concrete and block paving.
  • Kills tough weeds and their roots including: Ground Elder, Nettles, Docks, Couch Grass, Japanese Knotweed, Brambles, Bracken & Ivy.
  • Each box contains 3 x 8g Simple ready measured soluble doses and treats up to 75sqm. Apply at any time when weeds are showing green leaf and are actively growing.
  • Sold with our durable 9L or 2 gallon capacity galvanised steel watering can with removable brass rose. Colour cannot be guaranteed. Watering can will be randomly picked and despatched.
  • Keep children and pets away from treated areas until the spray has dried.
Bestseller No. 2
Bayer Garden 2 x Path, Patio & Drive Weed Killer - 3 x 8g Sachets per pack treats upto 75sqm - Kills Ground Elder, Nettles, Docks, Couch Grass & Japanese Knotweed.
  • Ideal for clearing weeds from paths, patios and rives including areas of tarmac, concrete and block paving.
  • Kills tough weeds and their roots including: Ground Elder, Nettles, Docks, Couch Grass, Japanese Knotweed, Brambles, Bracken & Ivy.
  • Each box contains 3 x 8g Simple ready measured soluble doses and treats up to 75sqm.
  • Apply at any time when weeds are showing green leaf and are actively growing.
  • Keep children and pets away from treated areas until the spray has dried.
Bestseller No. 3
Elixir Gardens 4 Litre Deep Root Killing Glyphosate Weed Killer | 7.2g/l Herbicide & Weedkiller | Ready to Use Formula 4L Bottle x 1
  • Quickly & effectively clears areas of weeds and unwanted vegetation. Supplied with a handy spray gun and hose attachment for easy application.
  • Ready-to-use 7.2 gram/litre Glyphosate formula. NO DILUTION REQUIRED. Kills & eliminates weeds at the root.
  • One 4 litre bottle treats up to 140 sq. meters.
  • Perfect for a range of hard surfaces such as patios, decking, aggregates and driveways.
  • PLEASE NOTE: Depending on the type of weed and climate, please allow up to 7 days to see the effects of the treatment. Some weeds may take up to 4 weeks for the weedkiller to take effect.
Bestseller No. 4
Roundup Tree Stump Weedkiller, Super Concentrate 250 ml
  • Kills ivy japanese knotweed, saplings, brambles and nettles to the root
  • Kills up to 16 tree stumps
  • Contains a reusable pipette for specialist treatment of japanese knotweed
  • Kills the roots so weeds don't come back
  • Degraded in the soil by micro organisms
Bestseller No. 5
Job Done 86600140 Tough Weedkiller, Weedkiller Protects for 3 Months, 1L, Ready-To-Use, Black
  • Nothing kills tough weeds faster and prevents for longer
  • Kills deep rooted weeds such as brambles, nettles, thistles and many more
  • Visible results within 24 hrs
  • Provides 3 months protection against new weed growth
  • A systemic and residual weed solution