I haven't tried it personally, but have read where it was used under controlled conditions and it's effectiveness was variable. The main factor affecting it's effectiveness seemed to be the amount of irrigation. In cases where it was applied and watered in and then irrigation was minimal thereafter it worked best, but areas where frequent irrigation/rainfall would be expected after initial application it's performance decreased.

Preemergents will not affect the germination of beans or peas or other legumes, onion sets, or members of the parsley family (carrots, dill, parsnip). Also not effeced are wild relatives of these plants, like Queen Ann's lace, clover, crown vetch. Even thou the package my say it is safe, do not put it around young melon plants (I never tried cucumbers or squash, I never got over the "meloncholy." -Terry

Im in the same boat as im trying, for the first time, a pre emergent. I also have empire. Im in SW florida. I bought a gallon of surflan. I have read good things about this one. My extension office (lee county) says to put it down the first week of feb for south florida. Im fighting goosegrass, they say to wait 3-4 weeks longer for this type of weed. I wonder if I shoudl put some down in nov or dec also? What county are you in?

Herbicide Safety and Weed Control Comparison in Spring Seeded Kentucky Bluegrass "Early spring preemergence herbicides are often necessary in Indiana to prevent troublesome annual grassy weeds such as crabgrass and goosegrass. Additionally, these applications help to prevent the emergence of some broadleaf weeds. Most preemergence herbicides work to kill weeds by preventing cell division causing death to weed seedlings shortly after they germinate. All preemergence herbicides (except Tupersan) work to prevent the emergence of turfgrass seeds as well as weed seeds, so a turf manager cannot use a preemergence herbicide if they plan on seeding in the spring. As mentioned, Tupersan (siduron) may be used for preemergence control of annual grassy weeds in newly seeded cool-season turf. Another strategy is to use a postemergence herbicide instead of a preemergence herbicide to control crabgrass and other weeds in late May and June that is safe to use on seedling turf. Options include Drive XLR8 (quinclorac), Quicksilver (carfentrazone), Tenacity (mesotrione), and SquareOne (quinclorac + carfentrazone). These products can be most safely used very soon after seeding to control crabgrass (see label for exact details on each turf species). If the seedlings are more mature (have been mown 2-3 times following their emergence) then other products such as Q4 Plus (quinclorac + sulfentrazone + 2,4-D + dicamba), Onetime (quinclorac + MCPP + dicamba), or Solitare (quinclorac + sulfentrazone) can also be used. The objective of this experiment was to evaluate herbicides at three different application timings for use in establishing Kentucky bluegrass from seed in the spring."