Introduction

Japanese Knotweed continues to be one of the UK’s most invasive and damaging plant species — and Wales is no exception. In fact, due to the region’s damp climate and rich soils, knotweed thrives particularly well here. Whether you’re buying a property, selling one, or simply concerned about its spread near your home, this 2025 guide will help you understand your rights, responsibilities, and options for safe, legal knotweed removal.

What is Japanese Knotweed?

Japanese Knotweed (Fallopia japonica) is a fast-growing perennial weed that spreads through underground rhizomes (root systems). It can grow up to 10cm per day during peak season and is known for damaging property foundations, drains, driveways, and walls.

It’s so serious that it can impact property values and mortgage approvals.

Why is Japanese Knotweed a Major Problem in Wales?

  • Ideal climate: Wales’ wetter climate creates perfect growing conditions.

  • Historic rail and river networks: Originally planted by rail and canal companies in the 1800s for soil stabilisation.

  • Rural spread: Knotweed can quickly overtake farmland, gardens, and riverbanks if left untreated.

How to Identify Japanese Knotweed

Look for these signs throughout the year:

  • Spring: Reddish-purple shoots with rolled-up leaves emerging from the ground

  • Summer: Tall green stems with bamboo-like joints, large spade- or heart-shaped leaves

  • Autumn: Cream-white flower clusters form

  • Winter: Hollow brown stems die back above ground, but rhizomes remain active underground

Tip: Download our free [Japanese Knotweed ID Guide] for Welsh homeowners.

Is Japanese Knotweed Illegal in Wales?

While it’s not illegal to have knotweed on your land, it is illegal to allow it to spread into the wild or onto neighbouring land under the Wildlife and Countryside Act 1981.

Key Legal Points:

  • You must not cause it to spread — even accidentally.

  • Disclosure is required when selling your home (TA6 form).

  • Mortgage lenders often require a treatment plan with a long-term guarantee.

What To Do If You Suspect Knotweed

  1. Photograph the plant and its growth stages.

  2. Avoid disturbing it — cutting or digging can cause spread.

  3. Call a professional like Japanese Knotweed Elimination Ltd.

  4. Don’t rely on DIY sprays — they rarely kill the rhizomes.

Our 4-Step Knotweed Removal Process

At Japanese Knotweed Elimination Ltd, we follow a proven, compliant method:

1. Free Site Survey

A qualified technician will assess your property and create a map of affected areas.

2. Custom Treatment Plan

Options may include:

  • Herbicide treatment

  • Excavation

  • On-site burial with root barriers

  • Monitoring and regrowth control

3. Insurance-Backed Guarantee

Up to 10 years — essential for sales and mortgage compliance.

4. Aftercare & Monitoring

We’ll revisit the site to ensure total elimination.

How Much Does Japanese Knotweed Removal Cost in Wales?

Service Type Typical Cost Range
Herbicide Treatment Plan £1,000–£3,000
Excavation & Disposal £5,000–£10,000+

Note: All quotes are tailored to your site after a full inspection.

Can I Still Get a Mortgage?

Yes — but you’ll need:

  • A plan by a PCA-accredited contractor (like us)

  • A valid guarantee (5–10 years)

  • Proof of ongoing treatment or clearance

Pro Tip: The earlier you act, the smoother your sale or purchase will be.

Why Choose Us?

  • Local Expertise: Based in Wales — fast response and deep local knowledge

  • PCA-Qualified Professionals

  • Environment Agency-Compliant Techniques

  • Discreet, Friendly Service

  • Emergency Appointments Available

Frequently Asked Questions

Q: Can knotweed grow back after treatment?

A: Yes, if not treated properly. That’s why monitoring and follow-up is essential.

Q: What if my neighbour has it and does nothing?

A: You may have grounds for a civil claim. We can advise you and provide reports to support your case.

Q: When is the best time to treat Japanese Knotweed?

A: Late summer to early autumn is most effective, as the plant draws nutrients (and herbicide) into its roots.

Need Help? Call the Experts

If you’ve spotted Japanese Knotweed in your garden or near your property, don’t wait. Early action can save you thousands in repair and removal costs.

Call Us Now: 07582 869979

Or visit www.knotweed-wales.com to request a free quote and survey.