Award-winning contractor, PCA and TrustMark member
Japanese knotweed removal specialists in Manchester and the North West
Book a free site survey with a PCA certified surveyor. Treatment and removal backed by a 10-year insurance-backed guarantee.
10-year insurance-backed guarantee
For you and your lender
Not sure it’s knotweed? Send us a photo
Free identification
- 20 years Experience with invasive plants
- 10 years Insurance-backed guarantee
- 2018 PCA Contractor of the Year
- 5.0 Google rating from 12 reviews
Why Weedtec
Knotweed work you can hand to a lender
Treatment takes years, so the company behind it matters. These are the facts you can check before you book.
About Weedtec
20 years of getting rid of Japanese knotweed
We are based in Greater Manchester and work throughout the UK, for homeowners, housing associations, councils and contractors of all sizes. You get sound advice, clear site reports and a team that follows the PCA Japanese Knotweed Code of Practice.
- PCA certified surveyors (CSJK), based in Greater Manchester
- Field staff hold NPTC pesticide licences PA1, PA6A, PA6AW and PA6D
- Fixed-cost quote within a day of the site visit
- Stage payments, plus credit and debit cards
“He continues to make site visits to check the area, he is easy to communicate with and an expert in his field.”
Services
Japanese knotweed removal and treatment
We control, treat and remove Japanese knotweed throughout the UK. The free site survey tells you which method fits your site.
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Herbicide treatment
A treatment plan that reaches the foliage and the rhizome, which can spread up to 12 m from the crown. Usually 1 to 4 growing seasons.
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Stem injection
A calibrated dose of herbicide into the bottom node of each stem, so only the knotweed is treated and nearby plants are left alone.
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Bulk excavation
Dig out the rhizome when the ground has to be clear fast, for example before building work starts.
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Dig and dump
Excavated knotweed is controlled waste. We remove it to a licensed landfill with the right waste carrier paperwork.
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Root barriers and membranes
Vertical or horizontal root barriers stop knotweed spreading back onto a clean site, and can cut the cost of removing soil.
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Site remediation
Full remediation before development for housing associations, councils and contractors of all sizes.
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Cost
How much does Japanese knotweed removal cost?
Every site is different, so we price after a free site visit. We know what works, so our prices are cost-effective, and we won’t be beaten on price by a reputable competitor.
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Fixed-cost quote within a day
After the site visit you get a fixed-cost quote and a clear site report, usually within a day.
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Stage payments
Spread the cost of the work. Credit and debit cards accepted.
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Bondpay for lenders
If your lender holds back the cost of treatment, it can be secured as a bond payment.
From our sites
Our work on site
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Excavation with root barrier
Membrane laid so knotweed cannot spread back onto the clean site.
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Rhizome lifted on site
The orange flesh inside the rhizome is how you tell it is live knotweed.
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Stems dug out at the crown
Red nodes and speckled stems, typical of Japanese knotweed.
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Established stand of knotweed
Mature canes grow up to 3 m tall and look like bamboo.
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Leaves on a zig-zag stem
Shield-shaped leaves with a flat base, the easiest sign to spot.
How it works
How we get rid of Japanese knotweed
From the first visit to the guarantee. The treatment plan is effective from the first day, which matters if you are selling.
- Step 1
Free site survey
A PCA certified surveyor visits, confirms the plant and measures the infestation.
- Step 2
Fixed-cost quote
You get a fixed-cost quote within a day of the site visit, with clear site reports.
- Step 3
Treatment or excavation
Herbicide and stem injection over 1 to 4 growing seasons, or excavation when the ground must be clear sooner.
- Step 4
10-year guarantee
An insurance-backed guarantee covering regrowth from the start of treatment, for up to 10 years.
Google reviews
What our customers say on Google
Google rating
5.0
Based on 12 reviews
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Keith Middleton
4 years ago
Andy confirmed the JNW and developed and implemented a remediation plan to remove it. He continues to make site visits to check the area, he is easy to communicate with and an expert in his field which gives my wife and I confidence in his professional judgement.
Posted on Google
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Rick cee
6 years ago
Andy was brilliant sorting our site out, the service by Weedtec was above and beyond excellent! Very competitive price and on going monitoring of our site. Thank you for coming to the rescue!
Posted on Google
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David Corbett
5 years ago
Brilliant prompt response and site visit, followed by e-mailed action plan. Really nice guy us Andy. Treatment planned and imminent. No doubt will be 5 star on completion of protracted herbicide treatment.
Posted on Google
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marie henderson
4 years ago
Andy has been fab. Always responsive to emails and has gone above and beyond. Would truly recommend
Posted on Google
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Stephen Davies
4 years ago
The service from Weedtek was professional and consistent over the years the knotweed was eradicated, recommended.
Posted on Google
Japanese knotweed heat map
Is there Japanese knotweed near you?
Reported sightings across Great Britain, grouped into 10 km squares. Pick a town to see how many records are around it.
Areas we cover
Source: NBN Atlas occurrence records of Reynoutria japonica licensed CC-BY, OGL or CC0, retrieved October 2026. Sightings are reported by recorders and are not a full survey. Northern Ireland is not shown.
Free site survey
Book your free site survey
Tell us where the plant is and we will arrange a free site survey with a PCA certified surveyor.
- Step 1 You send the form, with a photo if you have one.
- Step 2 We confirm it is knotweed and book a site visit.
- Step 3 You get a fixed-cost quote within a day of the visit.
Prefer to talk?
0800 195 8625Mon–Fri 8:00–17:30. Evenings and weekends by callout only.
Send a photo on WhatsAppRequest sent
Thanks, . We will call you on to arrange your free site survey.
If it is urgent, call 0800 195 8625.
FAQ
Frequently asked questions
Short answers to what people ask before booking a survey.
How do I know if I have Japanese knotweed on my property?
Send us a photograph by email or WhatsApp and we will reply with the answer. If it is knotweed, we can book a free site survey.
What does Japanese knotweed treatment cost?
Every site is different, so we price after a free site visit. You get a fixed-cost quote within a day of the visit. We have not been beaten on price by reputable competitors.
Can I spread the cost of the work?
Yes. We offer stage payments and accept credit and debit cards. If a lender holds back the cost of treatment, we can arrange for it to be secured as a bond payment through Bondpay.
How long does treatment take?
A herbicide and stem injection programme usually takes 1 to 4 growing seasons, depending on how far the knotweed has spread. Excavation clears the ground faster.
Can I treat Japanese knotweed myself?
Many people try, but shop-bought products are weaker than the herbicides a licensed company can use. DIY treatment often looks successful, then the plant returns stronger the next season and is harder to remove.
What does the law say about Japanese knotweed?
Having it on your land is not illegal, but it is an offence to cause it to spread. Knotweed is controlled waste and must go to a licensed landfill, carried by a licensed waste carrier.
Are the chemicals you use safe for pets?
Yes, they are safe for people and pets. Some products are not allowed in certain situations, which is why we always visit the site first.
Don’t gamble with Japanese knotweed
Book a site survey with a PCA certified surveyor
The survey is free. If you suspect knotweed, don’t be alarmed: call us or send a photo and we will tell you what it is.
Guides
Selling or buying a house with Japanese knotweed?
Some lenders refuse mortgages when knotweed is within 7 metres. These guides explain what to expect and what we can provide.