RE: [gardeners] Miracle Grow Weed Preventer

Dorsett (
Wed, 27 Jun 2001 20:51:20 -0500

Trifluralin is a root inhibitor that is incorporated into (binds with)
soil.  I imagine binding turns it into a slow release treatment that
doesn't stand much chance of damaging established roots but is very
damaging for roots of newly sprouting plants.

Transplants need to reestablish feeder roots to successfully merge with
their new home...and trifluralin would inhibit that feeder root growth,

Apply it after you've planted a bed and it doesn't get a chance to bind
with soil first -- it might even be absorbed by transplant roots in
concentrations that are strong enough to cause damage to delicate
transplant roots...even if they aren't feeder roots...which would be
even more of a setback than transplant shock delivers.
If you over apply Preen and need to neutralize what's there:  Apply
activated charcoal at the rate of 1lb. per 100 sq.ft. Lightly work into
surface of soil. Water each day for 3 days. It should be neutralized two
days after that.

 Barb in Southern Indiana  Zone 5/6
    A root is a flower that disdains fame.

> Can't be used after transplant, can be used up to 10 weeks
> prior to planting
> up to 1 day prior to transplanting.  So what's the difference
> between 1 day
> prior to transplant and after transplant?  It isn't going to
> dissipate in 24
> hours.
> My son used this product last year 2 or 3 times in his
> vegetable garden after
> the plants were established.  He grows squash, beans, chiles,
> tomatoes, etc.
> He had a huge harvest.
>  Now what is the deal on this stuff?
> What is it really and will it harm my plants?
> It doesn't hurt bees.
> Mary-Anne