One of the World’s Worst Weeds

Grass, Invasive pest plant, Oslo Riverfront Conservation Area

Cogongrass (Imperata cylindrica) is regarded as one of the world’s worst weeds. Its inflorescence is a fluffy (plumose) as pictured above.

We encountered this pernicious plant at the Cypress Bend Community Preserve this Spring in flower. Volunteer Ken Gonyo took note of its distinctive yellow-green appearance, off-center midrib, and serrated leaf margins. So, when he saw it at the Oslo Riverfront Conservation Area very recently, he was able to identify it and acted quickly.

Recently, he sent this photo of the results of his handiwork with herbicide …


Kudos and Thanks to Ken!

3 thoughts on “One of the World’s Worst Weeds”

  1. Judy Gersony says:

    Excellect description and follow up control. This grass always requires a follow up treatment the following year or years. Trust me I know! For a good article on control measures see EDIS:


    • Ken Gonyo says:

      I treated this Cogongrass with dilute 3% glyphosate. I am surprised at the quick die off at that dilution, but aggressive followup will continue.


  2. Diane Morgan says:

    Go Ken! John Warner c omes regularly to yank the Caesarweed…..


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