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Does Glyphosate and/or 2-4-D concentrate go bad?

About 3 (or more) years ago I bought some big containers of both herbicides as concentrate. As they age, do they go bad, or get stale and not kill as they would if they were fresh/fresher?

If they weaken, could I maybe just mix them a bit stronger? I'll not be using them on the lawn or in areas used by pets or people It is for attempting to kill off numerous non native invasive things as well as some other stuff in areas I want cleared off for future use.

tia

Sue

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