Japanese knotweed
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Japanese knotweed
Japanese knotweed (Fallopia japonica) growing rapidly after being cut back. Japanese knotweed is a tough, highly invasive perennial, that was introduced to this country by the Victorians. It grows to two to three metres high every spring, often crowding out native species, its roots grow at least as deep. It is incredibly hard to kill, as less than one gram of living rhizome, a horizontal underground stem, is needed to regenerate a plant. There are few chemicals that can destroy the plant, and biological control, the use of introduced fungi or insects, is now being considered in the UK. It is now illegal to plant Japanese knotweed in the UK
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6281201
© SHEILA TERRY/SCIENCE PHOTO LIBRARY
Biological Control Introduced Species Invasive Japanese Knotweed Perennial Rhizomatous Rhizome Weed Worst Invasive Alien Species Fallopia Japonica Rhizomes
EDITORS COMMENTS
This print captures the relentless growth of Japanese knotweed (Fallopia japonica) after being cut back. Originating from Japan, this highly invasive perennial was brought to our shores by the Victorians and has since become a formidable force in our natural landscapes. Standing at an impressive two to three meters high each spring, it often outcompetes native species, posing a threat to biodiversity. What makes Japanese knotweed particularly challenging is its resilience and ability to regenerate from just a tiny fragment of living rhizome - less than one gram is enough to sprout new life. Its deep-rooted system further complicates eradication efforts, as it can penetrate through concrete and cause structural damage. Conventional chemical treatments have proven ineffective against this botanical menace, leaving researchers with limited options for control. However, hope lies in biological control methods that involve introducing specific fungi or insects to combat the plant's spread. In the UK, authorities are now exploring these biocontrol measures as a potential solution. The photograph serves as a reminder of the ongoing battle against this worst invasive alien species. With its intricate network of rhizomes and tenacious growth habit earning it the title "superweed". Japanese knotweed continues to challenge scientists and conservationists alike in their quest for effective management strategies.
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