Dear Readers, a few weeks ago I was alerted to the presence of Japanese Knotweed growing beside the playing fields which border Coldfall Wood. A worried person had reported the plant to Haringey Council, because he was concerned that it would spread into the wood itself. It was reported that children were using its stems as swords, and that ‘Japanese’ ladies were taking cuttings. Naturally, I had to see this botanical phenomenon for myself.
How can you identify Japanese Knotweed? Its leaves are described as ‘shield-shaped with a flat base’.
“There is a real lack of information and understanding of what Japanese knotweed is and the actual damage it can cause. Without actual advice and guidance, surveyors have been unsure of how to assess the risk of Japanese knotweed, which can result in inconsistent reporting of the plant in mortgage valuations. RICS hopes that this advice will provide the industry with the tools it needs to measure the risk effectively, and provide banks with the information they require to identify who and how much to lend to at a time when it is essential to keep the housing market moving.”
As a result of this, many lenders relaxed their criteria, and are now mainly concerned with the plant if it is growing within 7 metres of the property. If so, it will ask for a guarantee of elimination. Many companies are now offering ‘Knotweed Solutions’ and a warranty to vouch for the extermination of the plant.Property Care Association chief executive Steve Hodgson, whose trade body has set up a task force to deal with the issue, said:
“Japanese knotweed is not ‘house cancer’ and could be dealt with in the same way qualified contractors dealt with faulty wiring or damp.”
By the way, I suspect that trying to get rid of a well-established plot of Japanese Knotweed by yourself would be back-breaking and probably ineffective, plus the remains of the plant are classified as ‘Controlled Waste’, which requires disposal at registered Landfill sites.
Japanese Knotweed is not new to the UK – it was first introduced in 1825 as a garden plant, and was first recorded in the wild in 1886. As I turn to my trusty Flora Britannica by Richard Mabey, I discover that it was a great favourite with Victorian gardeners, although they tended to plant it in their plantations and by their streams as it was too vigorous for any smaller space. Alas, it was a plant with ambition, and by 1900 was growing wild in London. By the 1960’s it was everywhere, from Lands End to the northern tip of the Isle of Lewis. In Cornwall it is known as ‘Hancock’s Curse’ because it was originally planted in the garden of a Mr Hancock. Everywhere it is discovered it seems to generate a frisson of alarm, much as if John Wyndham’s Triffids had turned up. And yet, like all plants, Japanese Knotweed is not an unalloyed monster, just a plant that has found itself in a habitat that is to its liking, and which is taking advantage of the fact.
It should not be forgotten that Japanese Knotweed is also a valuable plant for pollinators, and is useful for beekeepers because it flowers late into the year, when many other plants have past their prime. The honey is said to taste like a mild form of Buckwheat honey, which is not surprising as Buckwheat is another member of the family that includes the Japanese Knotweed.
So Japanese Knotweed, like any plant, is not a thug without any redeeming features. In its original habitat, I suspect that it was a graceful, useful plant, and maybe it could be here, too.Few organisms are entirely heroes or villains, and it is often our lack of knowledge that makes us consider them so. There is no substitute for a little research, and for taking a deep breath before demonising anything, plant or animal.
What good sense.All the same, I won’t pick any leaves or stems to eat in case glysophate is coursing up them…
Good point, Ann. You never know when the council have been in with the RoundUp, or worse….
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