How long is Preen weed preventor effective? - Knowledgebase Question

Name: Angela Sweeny
Smithtown, NY
Question by asweeny
April 11, 1999
How long is Preen weed preventor effective? I've used it with transplants with great results for the past three years. Last application was June 1998, but now I plan to direct-sow annual wildflower seeds later this month (April 1999). I don't see any Preen granules left, and in fact, quite a number of cosmos, poppies and violets self-seeded from last year's garden in certain areas where there's no run-off. I'm wondering if it's OK to go ahead and direct sow, or will some remaining Preen from last year still prevent seed germination?


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Answer from NGA
April 11, 1999

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Unfortunately I am unable to give you specific information about individual proprietary products such as Preen. If you have questions about it, please contact the manufacturer.

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