Posted on May 03, 2024

Identifying and managing Japanese Knotweed this spring

A Spring Awakening

It’s getting to be that time of year when we’re all enjoying the lighter mornings, taking our first tentative steps back outdoors and watching spring starting to gradually unfold.

One plant that isn’t a joy to watch emerging is Japanese Knotweed! Unfortunately, this infamous plant is also starting to wake up and poke its head up above the ground.

Depending on the famous British weather and whereabouts in the country you live, if you look carefully, you may be able to spot the very first signs of it emerging if you know what you are looking for. In spring, the reddish-purple fleshy shoots emerge from crimson-pink buds down at ground level, either from the ‘crown’ or from the rhizomes spreading out from the original plant. The buds then grow into new shoots that can look very similar to asparagus spears! 

Japanese Knotweed with spring sprout close up

Finally, it grows into the familiar ‘bamboo-like canes’, which can grow up to 10cm a day and 3m tall by the summer. They have characteristic purple flecks and produce branches from nodes along their length in a characteristic zig-zag fashion.

All of this growth is produced from the energy and nutrients stored in the plant’s rhizomes, which have been generated from the previous year’s growth. The process of energy collection and storage is repeated every year, and the stand grows ever larger each season.  It has been reported that these rhizomes are able to lay dormant underground for up to 20 years, helping to fuel its fearsome reputation.

With our ‘one-stop shop’ solution, we ensure our clients can get an early start on their plans to control Japanese Knotweed. This comprehensive approach, including the availability of Certificated Surveyors of Japanese Knotweed (CSJK) accredited by the Property Care Association (PCA) and Ecologists, who are skilled and proficient in identifying this and any other INNS that may be present on your site, will effectively address your INNS problems.

The Thomson Environmental team are also able to develop management and remediation plans for your project site together with the ability and experience to complete all of the recommended works, using qualified and trained personnel – leaving you free to enjoy the wonders of spring!

You can rest assured that we have all your needs covered.

Interested in finding out more about all things Thomson environmental consultants? Sign up to receive all our communications.










    Want the latest news straight to your inbox? Sign up now for our newsletter

    We can keep you informed and up to date with all the latest news at Thomson environmental consultants. 










      Knowledge Hub Identifying and managing Japanese Knotweed this sp...