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Japanese knotweed

The Environment Agency's Japanese knotweed code of practice was originally published in 2006. After several revisions, the publication was withdrawn on 11 July 2016:

"This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance."

However, the Property Care Association - the UK's trade association for specialists who deal with problems that affect buildings - published its own code of practice in April 2018.

(Note that the PCA's code of practice is NOT the law. It is merely a document that explains the best practices for controlling Japanese knotweed. If you're looking for official government guidance and legislation, see gov.uk's page on how to stop invasive plants from spreading.)

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Summer's here, which means that Japanese knotweed plants in the UK are currently in the most aggressive phase of their growing cycle (see When Does Japanese Knotweed Grow? for more information on that).

Japanese knotweed

Photo by Leonora Enking (View Original)

Japanese knotweed is at its most visible during the summer, so now is the time to have a look outside and make sure this invasive plant species is not growing on your property. If you suspect that Japanese knotweed is growing on your property, but you're not 100% sure, we recommend sending in a photo of the suspect plant. One of our professional technicians will be able to identify the knotweed plant and suggest a suitable course of action.

Japanese Knotweed Identification   Japanese Knotweed Removal

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Japanese knotweed, an invasive plant species

Japanese knotweed can be found all over the UK. Many British homeowners have had problems with this invasive plant species, but it is also abundant in the wild - on roadsides and near railway lines, for example.

What is Japanese Knotweed?

Ecologists are already employing all sorts of different tactics to get the UK's Japanese knotweed problem under control (perhaps you remember our recent blog post about the sniffer dogs who'd been trained for this purpose). But it's hard to defeat an enemy whose location is unclear, and one big hurdle in the fight against Japanese knotweed is the fact we don't know exactly how widespread the plant is.

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Artificial Grass

You might be surprised to read this, but artificial grass is not immune to weeds. True, a fake lawn requires less maintenance than a real one, but going artificial doesn't necessarily mean that you'll never have to worry about weeds again.

As a general rule, you will only ever notice weeds growing around the edge of your artificial lawn, although it is possible for weeds to push through from beneath - especially if your fake grass was installed without a weed-resistant membrane.

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Counting time on a watch

SHORT ANSWER: Japanese knotweed can grow up to 10cm per day during the summer months.

Japanese knotweed has a reputation for fast, aggressive growth. Not only can this invasive plant species grow through cracks in brickwork and concrete, it can do so with rather frightening speed!

Japanese knotweed's growth rate depends on the time of year. As we've discussed previously (see When Does Japanese Knotweed Grow?) the plant goes dormant during the winter months, then re-emerges in the spring.

Summer is when the plant hits its top growing speed. Japanese knotweed loves warm weather, and it has been known to grow by as much as 10cm per day during the summer months!

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