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How long does Roundup last in the soil?

FAIRBRJU · 2014-10-22 02:41:15

Hi - There's a potentially lovely rockery in my garden (newly acquired) that was hidden under a log-pile. Now that the logs have gone, the earth is full of ground elder roots that are difficult to remove. If I put round-up down and cover over for the winter, will it be OK plant up next year as I'm not sure how long…