About Us

Japanese Knotweed Expert

At Japanese Knotweed Expert Limited we have been eradicating Japanese knotweed for over 18 years. As such, we have the experience to deal with any breakout of this invasive weed. We are so confident in our service that we offer a 10 year guarantee on all of the work that we carry out.

We are based in the West Midlands, however we cover the whole of the UK, helping our clients to remediate Japanese knotweed and other invasive weeds. At our head office in Stoke on Trent, we have a dedicated office team who are on hand to assist our clients with queries, as well as offer advice to property developers, builders, estate agents and architects.

Honesty is an integral part of our company ethos…

We have approximately 20% of our clients that say they have Japanese knotweed and then it turns out to be something quite different. If it turns out to be something other than Japanese knotweed, Japanese Knotweed Expert can confirm this for you in a report, which is covered by the initial fee.

What are our Qualifications?

Japanese Knotweed Expert are one of only a handful of companies in the UK that has a fully qualified PCA surveyor – this is the qualification a mortgage company will need to see on any reports that are produced. We also have the necessary NPTC qualifications including:

  • Pa1, Pa6 & Pa6aw

The ISO qualifications that we hold, ensure not only the correct processes are in place but also that we engage in the latest best practice methods.

  • ISO 9001:2016 certified
  • ISO 14001:2015 certified
  • BS OHSAS 18001:2007 certified

We also have a series of NVQs and diplomas including levels 1-3 in horticulture, making us more than qualified to deal with Japanese knotweed and any other invasive weed.

Japanese Knotweed Expert meet all the requirements of RIC’s and Mortgage lenders.

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Meet the Team

Jason Harker Website

Jason Harker


Jason is the Owner and Manager of the company and will always conduct the initial face to face meeting and carry out the site survey.

Jason is a qualified PCA surveyor which means he is recognised by the mortgage companies to survey a site for Japanese Knotweed. With 20 years of experience he is able to manage all your requirements.

Jason writes a column for The Sentinel on a fortnightly basis giving expert advice on a range of gardening topics. He is on the panel of expert gardeners for Radio Stoke where he answers many gardening questions.

Jason is married and has two sons.

Chris Jones Headshot website

Chris Jones

Site Manager

Chris has been with the company since May 2008. He is our longest serving member of the team and is well respected for his work ethic and ability on the job.

Chris is site based and heads up his own team as well as managing the other teams.

Chris holds a degree in Forensic Science as well as other NPTC & NVQ qualifications.

He plays Sunday league football and has a keen interest in motorbikes and enjoys going to music festivals with his long term girlfriend.

Jack Headshot Website

Jack Logan

Team Leader

Jack has been with us since May 2014 and is in charge of Excavation. He monitors the the excavation sites to ensure the work is completed on time and to a high standard.  He leads a team of 3 other members.

Jordan G Headshot Website

Jordan Greatorex

Team Leader

Jordan has been with the team since 2014 and is a team leader with three members on his team.

Jordan joined the team as an apprentice gardener and is now a Team Leader. He has achieved NPTC, Pa1, Pa6 and Pa6aw which means not only can he spray chemicals he use them near water courses as well.

Emma Candlin Website

Emma Candlin

HR Manager

Emma started with us in August 2013 and manages the HR department. She deals with all aspects of recruitment and managing the on site team. When not at work she spends time with her husband and enjoys going out for meals and enjoying a glass of wine.