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 After several revisions, the publication was withdrawn on 11 July 2016:
"This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance."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.)
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).
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.
What is Japanese Knotweed? Identifying Japanese Knotweed
Here are five common Japanese knotweed signs to watch out for...
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.
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.
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!
If your school's playing fields have seen better days, we at Taylor Total Weed Control may be able to help.
We offer a professional grounds maintenance service throughout South Wales and South West England. Whether you need us to provide occasional support for your in-house groundskeeping staff or a regular, comprehensive grounds maintenance service, we have the expertise and equipment necessary to keep your playing fields in tip-top condition.
Like an unwanted house guest, Japanese knotweed can be difficult to get rid of. Patience and persistence are key to getting the job done properly.
Photo by Leonora Enking (View Original)
As we discussed in our blog about Japanese knotweed's growing cycle, this invasive species may appear to die off completely during the winter months. But appearances can be deceptive.
It's lovely having a patio - especially when there's a pandemic in progress and the government are saying that you can't leave the house - but it's not quite so lovely when you notice furry green moss growing in between your patio pavers.
Photo by Amy G (Flickr)
Unfortunately, moss is a very common problem on patios - especially in the UK, where the damp weather often creates ideal growing conditions for this unsightly pest of a plant.
When selling a property in this country, you have to fill out a TA6 form, which includes this question:
Is the property affected by Japanese knotweed?
☐ Not known
It's important for sellers to answer this question truthfully, because Japanese knotweed is an invasive species that can grow very rapidly and may cause structural damage if it grows through cracks in a wall or foundation. Homes with Japanese knotweed are notoriously difficult to sell, and getting rid of the plant can be an long and costly process.
READ MORE: Selling a House with Japanese Knotweed
Unfortunately, there are some dishonest people out there, and sellers will occasionally feign ignorance of their Japanese knotweed problem for fear that it will complicate the sale. So what should you do if you've discovered Japanese knotweed on your property...and the seller didn't tell you about it?
Spring was warmer than usual this year - as you no doubt noticed if you spent it cooped up at home due to the COVID-19 (coronavirus) pandemic.
Unfortunately, a warmer-than-average spring means that there'll probably be a lot of Japanese knotweed this summer.
READ MORE: When Does Japanese Knotweed Grow?
Summer is peak growing season for Japanese knotweed, although its first shoots start to appear around April. The first half of this year may have been a chaotic and disruptive period from our human point of view, but spring 2020 brought ideal growing conditions for Japanese knotweed, with plenty of warm weather and sunshine.