I think I have Thistle plants #333132 - Ask Extension


I think I have Thistle plants #333132

Asked June 16, 2016, 5:56 PM EDT

I have these spikey plants growing in my flower beds. These plants are aggressive. I pull, I cut, I spray. They keep coming back. If they are Thistle, how do I get rid of them. I read they have roots of 2 feet.

Prince George's County Maryland

Expert Response

The key to thistle elimination is persistence.  Cut them down to the ground and paint glyphosate (active ingredient in RoundUp and other herbicides) to the cut surface as soon as you make a cut.   As soon as you see the first baby leaves, hit them again with glyphosate.  Multiple applications may be necessary.   https://www.nps.gov/plants/alien/fact/ciar1.htm  http://www.na.fs.fed.us/fhp/invasive_plants/weeds/canadian-thistle.pdf  vw
The leaves have the spikes on them. Sorry, I forgot to get a picture.
The Question Asker Replied June 17, 2016, 12:54 PM EDT
This technique works for all plants. There are photos of thistles on the links included above if you want to check for similarity.


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