Celebrating the weed that engulfed western Pennsylvania. Japanese knotweed — Polygonum X bohemicum) are able to produce fertile seeds. You can get see plants from all over the world without ever leaving the herbarium. While I was at the Knotweed Festival, I collected some knotweed specimens for the Carnegie Museum of Natural History’s herbarium. 1  It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. It has hollow stalks that are persistent through the winter and look … In North America and Europe, the species has successfully established itself in numerous … Last year, I found all three knotweed species growing together at the same site near the Allegheny River and Barking Slopes Conservation Area, near New Kensington/Plum, PA.  Left to right: Japanese knotweed (Fallopia japonica), Bohemian knotweed (Fallopia xbohemica), Giant knotweed (Fallopia sachalinensis). The leaf hairs are sometimes the only definitive identifying feature. Brian Conway is a writer and photographer whose articles have appeared in the Chicago Tribune and local publications. A scourge for several decades, the giant knotweed species can tower 10 feet with its bamboolike stems and elephant ear-shaped leaves, smothering all natural vegetation in its path. And this invader is one of the most aggressive and widespread ones in western Pennsylvania – Japanese knotweed. Nothing grows earthworms like knotweed… Japanese knotweed has a large underground rhizome biomass so simply cutting the stalks won’t get rid of it. And Japanese Knotweed is so pervasive because we have similar weather and latitude as in parts of Asia, says Copeland. Bohemian knotweed specimen collected at the Knotweed Festival. In Garfield, at Healcrest Urban Farm, strawberry knotweed ice pops cost $3-$4 apiece. This project is made possible by the National Science Foundation under grant no. Many plant collectors often collect duplicate specimens to send to several herbaria. Japanese knotweed is a very serious invasive. It takes 3-5 years for a black locust to get above the 7'-10' knotweed stand a then really take off. I just have too much free time on my hands right … The nearby Conemaugh River that runs throughs Blairsville has been transformed by this non-native species, completely covering the banks with stands so dense they completely block the view of the river along the community recreational trail. The weed is everywhere. The three species are visually similar. The project began three years ago with the removal of Japanese knotweed, an invasive plant that smothers native plants and pollutes the soil. It is commonly known as Asian knotweed or Japanese knotweed. But before you start accompanying your meals with a side of sauteed knotweed, be warned that the plant absorbs whatever is in the ground, including lead and other toxins. Japanese knotweed, a persistent, exotic invasive plant in the Pittsburgh region, can make gardening difficult if not impossible. Japanese Knotweed Japanese knotweed, an ubiquitous, exotic invasive plant in the Pittsburgh region, can make gardening difficult if not impossible. Wang and J.L. I really … Japanese knotweed is a member of the buckwheat family. The weed that ate Pittsburgh sounds like a B-movie from 1957… But no, it’s a real story. Knotweed spreads through persistent below-ground structures called rhizomes (below-ground stems), as well as by seed. “It tastes the way a lemon smells when you squeeze it,” says Kevin Hermann, executive chef at Six Penn. Botanists at the Carnegie Museum of Natural History share digital specimens from the herbarium on dates they were collected. On one hand, it embraces the nature around us – whether we like it or not, non-native plants are part of the landscape around us. This specimen of Japanese knotweed (Fallopia japonica, formerly known as Polygonum cuspidatum) was collected in China on Sept 14, 1989 by Q.X. And this invader is one of the most aggressive and widespread ones in western Pennsylvania – Japanese knotweed. Brian lives in the South Side. The leaves of Japanese knotweed are usually 4 to 6 inches long, while the leaves of gi antkow edc rh12 s l distinctly … Native to East Asia, Japanese knotweed (Fallopia japonica) is a large herbaceous perennial … Giant knotweed can be distinguished by its large (usually much larger than your hand), heart-shaped leaves. In Pittsburgh, knotweed grows in abundance in empty lots and along the city’s rivers. Specimens collected from both the native and introduced ranges can … The Japanese used an alcohol extract of this plant as a natural laxative. In fact, about one-third of the 530,000+ specimens are from outside the United States. In Pittsburgh, Japanese knotweed (and related introduced knotweed species) form dense stands along rivers, streams, and roadsides. Although Collected On This Day posts tend to be biased towards specimens collected in Pennsylvania, the Carnegie Museum of Natural History herbarium includes specimens from many countries around the world. There’s a new invasive species finding its way onto dinner plates across the city. More troubling, the spread of the species displaces native vegetation and disrupts the natural function of the ecosystem. How do these species from far away regions end up at the Carnegie Museum? My family and I had a great time at the festival, visiting local craft and food vendors, listening to musicians and other entertainment, seeing a monarch butterfly display, and even a parade. The author ends the article on a sobering note, declaring that the plant is simply too prolific to be managed through human consumption alone. A very, very problematic species. Move over, Asian Carp. knotweed, full. It is native to East Asia in Japan, China and Korea. Despite the dislike for the plant, the community of Blairsville named the festival partly as a tongue-in-cheek sentiment for the plant that has taken over the landscape and partly to recognize the weed as embedded into the local culture. At first, I had mixed feelings about naming a festival after an aggressive invasive plant known to cause ecological harm. It grows to heights of 7 feet (2.1 m), and the roots can be twice that deep. “I don’t know if animals are moving the seed around perhaps. Plants such as Japanese Knotweed, Chinese Silvergrass and Japanese … Native to Japan and East Asia, Japanese knotweed is a hardy, fast-growing plant that can be extremely difficult to eradicate. It ’ s Wildland weed Management program to Asia, Japanese knotweed are much more difficult to eradicate Saltsburg! 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