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Old 09-24-2009, 12:58 AM
NkyLawncare NkyLawncare is offline
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Location: Taylor Mill, Ky
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Canadian Bull Thistle Weed!! Please Help

I've been fighting this weed all year but pulling it out (by root I thought), round up (killing my grass) and ortho weed b gone. Nothing has worked. Any suggestions for getting rid of this stuff. It's taking over a portion of my yard and flower beds.

Thanks guys
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Old 09-24-2009, 03:01 PM
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Groomer Groomer is offline
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I've been after it all season in my beds, try spectracide in a concentrate, mixed and spot sprayed with a backpack sprayer. You gotta keep after it, weekly if you have time, and catch the small sprouts. I've reduced its spread considerably, but it still lurks so I'll keep at it till frost.
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Old 09-25-2009, 08:12 PM
JNyz JNyz is offline
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gly. week after week until it is gone.
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Old 09-25-2009, 09:20 PM
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RigglePLC RigglePLC is offline
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Use something with dicamba, repeatedly--Three Way for instance. For tough weeds mix that with T-Zone--both at full strength and add spreader sticker. Repeat as needed. Mow or trim as often as needed to keep it cut off short--you don't want green leaves to send food to the roots (which are wide ranging and deep).

Remember Canada thistle creeps with long underground stems. You have to kill it all--or it will come back. Kill it wait for roots to sprout--kill it again--three times at least.

Last edited by RigglePLC; 09-25-2009 at 09:22 PM. Reason: addition
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Old 09-25-2009, 10:02 PM
ryansbob ryansbob is offline
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one word "Lontrel" expensive but it works great, mix it in a sprayer and spray, if you can take a hedge trimmer and cut the leaves first works even better if you do that before you spray.
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Old 09-25-2009, 11:58 PM
Smallaxe Smallaxe is online now
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Let it get large enough so the stem can soak in a lot of glyphosate. (Don't let it go to seed of course.) ... Snip it off and paint the stub with undiluted G.

I believe the little ones - come from the roots of the big one.
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