Re: CULT: Preemergent

I've used Preen for several years now and sprinkled it on beds that were newly planted with iris in mid July or August. I've never noticed any adverse effect. One of my iris beds is right next to a native prairie planting and gets overwhelmed by prairie forbs if I don't keep it Preened, especially after I divide the irises in that particular bed.

Janet in Denmark, WI
zone 3/4


----- Original Message ----- From: "Loberg" <loberg@adelphia.net>
To: <iris@hort.net>
Sent: Friday, July 14, 2006 1:03 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. 
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