An Asset Or A Burden: The Two Sides of The Invasive Japanese Knotweed

With a scientific term of Fallopia japonica, the invasive Japanese Knotweed is a nonwoody plant that is native to eastern Asia, particularly in China, Japan, and Korea. It has empty stems with distinct nodules, making it look like a bamboo, although the two plants are not directly associated.

Even if the most frequently used scientific name of the plant these days is Fallopia japonica, it is also called in other scientific terms: Polygonum cuspidatum and Reynoutria japonica. The latter is its oldest name, which was given in 1777 by a Dutch botanist. In addition, its other English names include elephant ears, donkey rhubarb, fleeceflower, Himalayan fleece vine, Hancock’s curse, and pea shooters.

There are several applications for Japanese Knotweed. Beekeepers give importance to the plant as it is an essential source of nectar for honeybees at some stage in the year when there is little flowering. It creates monofloral honey, which is also known as bamboo honey. Moreover, the plant’s new stems are fit to be eaten, which taste similar to mild rhubarb. It is a great provider of vitamin A, vitamin C, manganese, phosphorus, potassium, and zinc.

Another known application of the plant is that it is a source of resveratol, the same substance found in the skin of grapes and red wine. The substance allows to lessen bad cholesterol, hence lowering the possibility of heart attacks. Another helpful substance taken from this plant is emodin, which helps normalize bowel movement. Likewise, the plant is especially useful because of its capacity to survive at any time of the year and in severe situation.

However, as much as Japanese Knotweed has many applications, it is deemed as an invasive plant especially in North America and in Europe. In the 19th century, the plant was introduced to the United States and Europe, and it was used to give food to animals, as an decorative plant, and to stop soil erosion. The plant has been discovered to be a burden, nevertheless.

It is deemed as one of the world’s 100 most horrible invasive species. It is considered as a grave threat to builders, land developers, and gardeners. Moreover, the dangers it may cause include damage to pavements, roads, drains, walls, and even buildings. It may also inhabit river banks, thus preventing passage to rivers. Another Japanese Knotweed problem is that it grows easily and quickly. It can spread from small parts of root cuttings, and it can grow up to three to four inches a day. As a result of the harm that this kinds of plant can cause, the UK for example has created the Wildlife and Countryside Act 1981. The Act bans its spread in the wild.

The Japanese Knotweed, definitely, has two aspects. It is an advantage and a liability all at once. And, it cannot be instantly ignored as a good or a bad weed at the same time.

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