Thistles! #309219 - Ask Extension

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Thistles! #309219

Asked March 25, 2016, 10:05 PM EDT

How does one get rid of thistles? Should I till the area? I have other shrubs I do not want to kill...thanks. Robin

Frederick County Maryland

Expert Response

With thistle the key to control is vigilance and persistence. Do not let the plant flower and go to seed. Mowing/clipping the tops whenever they appear will also help starve the roots. Use a small paint brush to apply a non-selective systemic herbicide, (active ingredient glyphosate as in Roundup and others) to the cut ends of the top growth will further help to suppress/kill the plants. Follow label directions for timing of the herbicide. Please see the attached publication from the Plant Conservation Alliance for management options
http://www.nps.gov/plants/alien/fact/ciar1.htm 
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