Philipp Franz von Siebold was fond of flowers and plants. That love of flowers and plants poses a major problem in Western Europe centuries later. One plant he brought with him from the East is causing a lot of misery. That is the Japanese knotweed. The plant that centuries later would make us say: Thank you, Philipp Franz von Siebold!
This article was previously published on the website of De Goede Huisvader. Later this article was moved to the website of Harm Jagerman. After the introduction of Artigenda (this website) and some adjustments, this article was published here.
Source: Wikimedia Commons.
Philipp Franz von Siebold werd vooral bekend door zijn onderzoek naar Japanse flora en fauna. In Japan zelf was hij uiteindelijk niet meer zo populair, want in 1829 moest hij het land verlaten. Hij werd beschuldigd van spionage. De reden: van Japanse vrienden had hij landkaarten gekregen van Japan. Het was in die tijd verboden om als buitenlander dergelijke landkaarten te bezitten.
Hortus Botanicus
Dankzij Von Siebold leerde Nederland de hortensia kennen. Ooit gepland in zijn kas (Nippon) en daarna via de Hortus Botanicus aan het Leidse Rapenburg verspreid over Nederland. Wie kent de plant niet? Roze, wit, blauw. Ook bij deze huisvader is de plant te vinden in de achtertuin. Ooit uitgegraven bij een dame die haar tuin wilde veranderen. Ik kon de plant gewoon gratis meenemen. Toen voelde ik mij een beetje Von Siebold. Ook hij nam van alles mee uit het Oosten om deze planten en bloemen dan in zijn eigen kas neer te zetten.
Source: Wikimedia Commons.
Japanese knotweed
The azalea or rhododendron was also transported to The Netherlands. Just like the hosta. These are all just fine and beautiful specimens. One ornamental plant that Von Siebold brought to the Western world wasn’t that beautiful. It was just some case of bad tares. Tares with a devastating effect. This was the Japanese knotweed, also known as Fallopia japonica or Asian knotweed.
Bamboo
I fear the day when I notice that this plant grows in my garden. A few years ago we had trouble getting rid of another oriental plant: bamboo. It was the roots of this plant that caused the trouble, just like the Japanese knotweed does. When cutting off the stems of the plants, the roots keep on growing. The Japanese knotweed is notorious because its roots can grow through concrete. You can cut off the stems, but the plant isn’t stopped. Nowadays Japanese knotweed grows everywhere in Europe, not just in The Netherlands.
Thank you, Philipp Franz von Siebold!
Thank you, Philipp Franz von Siebold, for introducing this invasive species to the Western world! Still, it wasn’t the only invasive species that was introduced in history. Take for instance the aquatic plant Cabomba. This plant is used inside fish tanks. It makes sure there is enough oxygen in the water, making the water better for the fish. Unfortunately, some dreadful day someone decided that they wanted to get rid of their aquarium and flushed it through the toilet or emptied the contents of the aquarium into open water. From that day on, Cabomba started growing in the Dutch waters. Whoever is responsible for this remains anonymous. The plant forms a threat to the plant- and wildlife in the Dutch waters. The plants grow very fast. Probably faster than the location that they originate from South America.
Examples
Some plants and flowers arrive unintentionally. They are ballast or “stowaways” of ships. This doesn’t apply to plants and flowers. Several animals have been introduced into the western world. Sometimes intentionally, sometimes not. The best-known example in The Netherlands is the rose-ringed parakeet. Birds such as these don’t have natural enemies and have adjusted to the sea climate. Other examples of exotic animals that made their way to The Netherlands and the rest of the Western world are the muskrat, procambarus clarkia (cambarid freshwater crayfish) and the harlequin, multicoloured Asian ladybeetle (Asian ladybeetle).
Source: Wikimedia Commons.
Vondelpark
Funny story about the rose-ringed parakeet: it is believed that these birds were set free one of the major parks in Amsterdam (Het Vondelpark) by a city biologist. I wasn’t able to find any evidence for this. The first birds that moved freely might have escaped captivity. These birds aren’t the only ones who can adapt. Take for instance the seagull. This bird isn’t only to be found at or near the coastline. Well, the seagull isn’t the best example though, since this animal has been living here for centuries.
Source: Wikipedia.
Beer
What to do about the nuisance caused by these animals? We can place fences all over the country. This has been done in parts of The Netherlands to prevent wild boars from leaving the natural area known as De Veluwe. Unfortunately, birds aren’t hindered by fences. This is the same for everything that lives in the water. There are other options to consider. The Dutch television news (NOS) compiled an article about the Japanese knotweed and you can see an example of the usage of Japanese knotweed: turning it into beer. Well, one solution could be – when it comes to Japanese knotweed – to drink more beer…
