RE: CULT: Preemergent

I've been using a combination of Gallery and Barricade. Any thoughts on
potential problems? I try to dig and replant every other year.

Greg McCullough
Iris City Gardens
www.iriscitygardens.com
Primm Springs, TN

> -----Original Message-----
> From: owner-iris@hort.net [o*@hort.net]On Behalf Of J.
> Griffin Crump
> Sent: Saturday, July 15, 2006 5:51 PM
> To: iris@hort.net
> Subject: Re: [iris] CULT: Preemergent
>
>
> Kitty  --  I have used Preen for 32 years.   Whenever I establish
> a new bed,
> I apply the Preen as the last step, either mixing it into the top
> couple of
> inches of soil with a rake or, if I'm lucky, letting rain do it for me
> within 24 hours.  I transplant both adult plants and new seedling sprouts
> from containers into the new bed as soon as I have applied the Preen and
> mixed or watered it in.  But sometimes I have planted immediately after
> mixing in the Preen and watered afterwards.  The Preen granules form a
> chemical layer that prevents germination of most weeds.  Like
> most things,
> though, Preen isn't perfect.  It doesn't work against some common
> grasses or
> morning glories.  There is a preemergent called Snapshot that does work
> against morning glories and most grasses and can be applied right
> over your
> established plants, but it has become prohibitively expensive and is
> dangerous to use, because it will interfere with or prevent root
> growth of
> sprouts and even (I believe) retard newly-planted adult plants'
> adaptation
> to treated beds.  It stays in the soil for a couple of years, so,
> if you use
> it on an established bed, where it will do an excellent job, don't think
> about using that bed for seedlings for about 3 years.  --  Griff
>
>
> ----- Original Message -----
> From: "Loberg" <loberg@adelphia.net>
> To: <iris@hort.net>
> Sent: Friday, July 14, 2006 2:03 PM
> Subject: [iris] CULT: Preemergent
>
>
> >I spoke once before about the preemergent Trifluralin (Preen,
> MiracleGro,
> >others).   I would be interested in hearing people's comments on
> the best
> >timing to apply this product.   I've used it in the spring, and
> fall, but
> >not particularly when I'm digging and replanting irises.   The
> idea is that
> >it's not suppose to hurt irises that already have root growth
> established.
> >The label by the product manufacturer doesn't list using it with irises,
> >other than bulbous iris.   What has been other's experience as to the
> >timing of application of Trifluralin for preemergent weed
> control?  Is it
> >advisable to put on when planting, so that immediate watering
> won't bring
> >up a fresh crop of weeds?  Thanks.
> > Kitty Loberg
> > Northern Calif.
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