canadian thistles

I have been waging a futile war against Canadian Thistles for about 5 years now. It seems like the more I pull them out the ticker and stronger they come back. I am at my wits end. How do you eliminate them? The roots are long and each appears to be connected to another by deep root systems in the ground. Even spraying with week killer doesn't get rid of them. Please help. I am ready to take out all of my flower beds and just plant grass!
Submitted by BHGPhotoContest

You're right that the Canada thistles are difficult to get rid of. They are interconnected through the rhizomes underground. Your best bet for getting rid of them in an existing flower bed would be to spot treat with glyphosate (Roundup) by dabbing the glyphosate on the shoots of Canada thistle as they are actively growing, using a paint brush, or cotton glove over a rubber glove. Take caution to avoid dripping the glyphosate on your perennials because it can kill them, too if it comes in contact with them. However, the glyphosate won't be active in the soil, so as long as you touch only the thistles, your other plants won't be harmed.


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