Sedge is a difficult weed to get rid of. As you probably know by now, you can't pull up all the roots. In fact its a complete waste of your time to try to uproot THIS weed. So, you're left trying to treat it chemically.
From my experience, Glyphosate (round-up) and diquat don't kill the root system. So, even if you were to paint broad-spectrum herbicides on your sedge within your turf, you should expect to do it in another couple weeks. ...which completely sucks.
So, the two leading sedge killers are: SedgeHammer (or generics) and Dismiss [I've used both]. Sedge Hammer is targeted for the homeowner and Dismiss is serious stuff targeted for the professional. Dismiss has some very serious warnings, you're not suppose to use sooner than 30 day intervals and they don't give you the concentration for a hand sprayer...as if to say it is a bad idea to hand spray. But when you are really frustrated with sedge you tend to overlook those issues and look for the sedge nuclear bomb.
Dismiss yellows the sedge in 24 to 48 hours....which is satisfying. SedgeHammer takes about a week so you're left wondering if you hit the sedge or missed a spot...for a week. Dismiss was very effective against my "Globe Sedge" [at least that is what I believe it was] and much less effective against my yellow nutsedge. I'm currently on my second Dismiss treatment. I have also found it effective to stagger the application of SedgeHammer AND dismiss on the same turf area [did I mention sedge was hard to kill].
I also used Dismiss for a "high concentration" amount for a 1/2 gallon assuming I would spray that over 1000 sq ft. Dismiss was on my empire zoysia for around 48 hours without water. It browned up the zoysia -- which scared me. But, when the zoysia got some water it came right back to green.
Overall, I would buy Dismiss again.
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