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It is hard to tell from the pic of the seedhead. If you can grab a pic or two in better lighting I can probably tell you for sure. Right off hand, I’d say it looks like a Tridens species (ours down south I called purpletop), but the foliage doesn’t look quite right. Post up additional pics and we shall see.
 

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I would have thought that rate would’ve killed it. If it were stressed from drought, all bets would be off. Otherwise, I would’ve expected it to work. You are using relatively new glyphosate?
 

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it can. Certainly not a year old. A lot has to do with how it is stored. If in a hot barn, it can be affected. Same if it goes through freezing and thawing. Generally this isn’t a problem, though. Where I see it fail is when it is several years old, and it definitely can lose effectiveness over time.
 
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