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Question about Pre-emergents

Posted by ritaweeda (My Page) on
Thu, Mar 13, 14 at 8:37

Since I have a bad back, getting down to pick weeds in the garden beds is getting to be almost impossible. I started using Preen last year to see how effective it is, and although it has to be reapplied eventually, it seems to do the job very well. My question is, does anyone know exactly how this works? I know it prevents the seeds from germinating, but does it actually kill the seed forever or does the chemical wear off and then allows the seed to germinate eventually? I'm just wondering why it has to be re-applied in another 2 or 3 months. The downside of it is that I have always sown annual flower seeds in the beds but now I won't be able to do that. I'm going to try to start them in pots and plant them, I'm wondering if the Preen will keep them from thriving?

Follow-Up Postings:

RE: Question about Pre-emergents

The active ingredient, "TRIFLUORO-2,6-DINITRO-N N-DIPROPYL-P-TOLUIDINE", prevents germinating seeds from continuing to grow, that is any seed not just those unwanted seeds we call "weeds". When applied per label instructions it should have no affect on growing plants. Depending on several factors this product needs to be reapplied every 9 to 12 weeks during the growing season because it breaks down, or is broken down, in soil.

RE: Question about Pre-emergents

Seeds will germinate, then fail to grow any further, so that seed is gone forever.

It won't affect well-started transplants.

Have you tried using a hula hoe when the weeds are tiny? You can stand up and kill them.

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