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snopro

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That a farmer trick
The best time to spray thistles Ray and Tyler is in the fall after the first light frost. The plant will recognize that winter is near and start putting all its energy into the root system to survive the winter. The only way to kill a Canada thistle is to kill the roots. The plant will completely die then and never regrow back. Any other spray application throughout the summer will just brown the top of the plant and it will regrow through the damaged plant and live another day. I use Heat in conjunction with Round Up because it needs a tank partner and all I am trying to just make the green go away as quickly as possible. Kochia, roundleaf mallow and grasses are what I'm targeting right now.
 

TylerG

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The best time to spray thistles Ray and Tyler is in the fall after the first light frost. The plant will recognize that winter is near and start putting all its energy into the root system to survive the winter. The only way to kill a Canada thistle is to kill the roots. The plant will completely die then and never regrow back. Any other spray application throughout the summer will just brown the top of the plant and it will regrow through the damaged plant and live another day. I use Heat in conjunction with Round Up because it needs a tank partner and all I am trying to just make the green go away as quickly as possible. Kochia, roundleaf mallow and grasses are what I'm targeting right now.
So just smack it with some round up after we get a frost?
 
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