Question: I mixed some Roundup last fall but did not use it. Is it likely to still have strength or has it deteriorated over the winter?
Answer: Unfortunately I am unable to answer such a product-specific question. You might find that information on the label or at the Roundup website http://www.Roundup.com/ or you might also contact the manufacturer.
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When singular and plural spellings differ, as in peony and peonies, try both.