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Old 11-29-2012, 08:53 AM
Duekster Duekster is offline
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Join Date: Jan 2007
Location: DFW, TX
Posts: 7,969
You can apply Pre-emergent any time but there are various windows for different weed concerns.

Poa is winter weed grass concern so I try to get in late august to Sept.

I apply Dimension 3 times a year, read Lable about a split program but I hit Sept, and split in Feb, May.

I have applied a 3 way on a really weedy lawn ( broad leaf) and there was some effect but not as much as you would have in the late winter spring.
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