WANTED: Be on the Lookout for This Forest Weed, Youngia Japonica
El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.
Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.
English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.
Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.Collapse ▲
Gardeners and land managers in North Carolina are no strangers to weeds. The combination of the climate and biogeography of our state creates a goldilocks growing zone for plant life. It is just warm enough for semi-tropical weeds, and just cool enough for the more northern problem plants. Oh the joys of dealing with plants!
But, there are some weeds that go beyond simply being a nuisance and move into being an invasive species that causes real ecological damage. This damage comes in many forms. In the case of the fairly new Asiatic Hawksbeard, Youngia japonica, you may not realize it is choking your forest until it is too late!
Another dandelion? What’s the problem?
The flowers of Asiatic hawksbeard look like tiny dandelions, but don’t let the size fool you. Each of those yellow flowers can make dozens of seeds, which fly on the air and spread quickly into the surrounding area. Usually in areas where you are not looking!
Asiatic hawksbeard isn’t like the typical dandelion. Left to its own devices, it will create monocultures of seedlings that crowd out any other species and will flower prolifically and produce copious amounts of seeds in days. Unlike many of our dandelions, Youngia japonica prefers part sun to deep shade, and is adept at moving into high-quality woodland habitats. It can grow in moist and dry soil, and clay and loam. Its adaptability and prolific life strategy make it a formidable invasive species.
The plants are plain, nondescript whorls of fuzzy, light green leaves when they are not in flower. They come up in the mid- to late-winter in North Carolina and are usually flowering in April and May for us. This is a great time to observe them because their leaves can blend in with lawns, green areas and native foliage. They grow as large or as small as they need to to survive. They can withstand mowing in a lawn setting, and will send out new flowers within days of mowing.
Another weed from Asia?
Youngia japonica hails from Eastern Asia and Australia and has been spreading throughout the globe for about a decade. It is hypothesized that the seeds have blown on the wind, were brought in on contaminated soil or packing material, or were transported on people’s shoes. At this point it is hard to say and it will be an invasive species we will be combating for decades to come.
We always seem to be talking about invasive plants from Asia, and that is because the climate is so similar, plants find it easy to grow here in the Southeastern US. It isn’t that they aren’t welcome. The problem is when these invasive plants do not have the natural predators and equal plant competitors here like they do in their Asian native ranges, which causes the plants to grow unchecked.
Pay Attention to Your Woods!
Make sure to keep an eye out for this new(-ish) invasive species. We are fortunate in Lee County to have many high-quality tracts of forest still intact and Youngia japonica is a threat to that quality. It has been observed in the County!
If you see it, pull up the plants or spray the rosettes with herbicide. If there is a larger patch, treat the area with herbicide and revisit the site for follow-up treatments, making sure to check back throughout the summer, as the plants can
germinate and go to seed multiple times a year. If you see it in flower and notice seeds drop, make sure to follow back around to the site to pull up or treat returning seedlings. They WILL be there. Be mindful of surrounding native vegetation! Be selective about where you are treating and always follow label directions.
Unfortunately, for those of you who have been managing the same property for years or decades, this invasive plant can affect you as well. Our modern climate and how much we move around requires diligent management and strong observational skills. Invasive species move around in many different ways and your property is connected to others’, even if you have good management practices.
NC State Plant Toolbox Profile for Youngia japonica
iNaturalist Profile for Youngia japonica, to see where it’s been seen
NC Invasive Species Council Profile for Youngia japonica
University of Florida Center for Aquatic and Invasive Plants