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Saturday, September 27, 2025

Grass Carpet within the Woods


Stiltgrass carpeting the bottom in Schenley Park, 16 August 2024 (picture by Kate St. John)

25 August 2024

At the moment of yr the woods in southwestern Pennsylvania typically look as if gardeners have eliminated all of the underbrush and left a thick carpet of grass on the forest flooring. The “gardeners” are overabundant white-tailed deer who selectively eat their favourite meals and go away behind invasive Japanese stiltgrass (Microstegium vimineum).

Japanese stiltgrass got here to the U.S. in packing crates within the early 1900s as padding to guard porcelain shipped from China. In fact we threw it out once we unpacked the crates. It took root and was found in Tennesse in 1919. Greater than 100 years later it blankets a lot of the jap U.S.

Vary map of invasive Japanese stiltgrass in North America (EDDMapS. 2024. Early Detection & Distribution Mapping System. The College of Georgia – Middle for Invasive Species and Ecosystem Well being. Obtainable on-line at http://www.eddmaps.org/; final accessed August 25, 2024.)

Japanese stiltgrass is fairly simple to establish as a result of it has a shiny midrib (topside) and the midrib is just not in the midst of the leaf (underside).

Shiny midrib on topside of Japanese stiltgrass leaf (picture by Kate St. John)
Back of the leaf: Japanese stiltgrass (photo by Kate St.John)
Japanese stiltgrass mid rib is just not within the center. Again of the leaf: (picture by Kate St.John)

Wonderful because it appears, Japanese stiltgrass is an annual that dies each winter and grows again from seed the subsequent spring. Its thick inexperienced carpet in summer season shades out native species.

Japanese stiltgrass carpet, Butler-Freeport Path, July 2017 (picture by Kate St. John)

After it goes to seed in early fall it dies and turns into a brown drape over the panorama in winter. This provides it the alternate widespread identify of Nepalese browntop.

Japanese stiltgrass in winter in PA, Dec 2017 (picture by Dave Bonta through Flickr Artistic Commons license)

Japanese stiltgrass comes again thickly yearly as a result of it drops a lot seed within the soil. It’s doable to eliminate it … finally .. by way of hand pulling or goats. Pittsburgh Parks Conservancy is utilizing each strategies in Hays Woods this yr.

When you’ve got Japanese stiltgrass in your yard, Penn State Extension has these sensible cures for eradicating it.

Watch this video for extra identification clues.

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