Prime Source Celsius WG - 0.226 oz Easy Mix Packet-Post Emerge Weed Control

The most effective selective herbicide I've used. Get yourself a two gallon hand pump or electric sprayer, some surfactant, mix it up and you're ready to go. As others have said, it works slowly but it's very effective. Bonus, it's less expensive than the common brands at big box stores when you consider you get two gallons out of one packet. Be sure to use it in the right conditions (season/temperature/precipitation/wind) for best results.

Celsius is the first lawn weed killer that I’ve used since starting my life as a homeowner this fall. It also might be the only lawn weed killer I use now! I used it for the first time last night on a group of thistles, prickly lettuce, and parsley in my St. Augustine and Bermuda yard. I used the strongest mix possible, but it was still encouraging to see these weeds wilting and yellowing at their bases today. And of course my grass was left completely unscathed. This herbicide is easy to mix because of the granular form and it’s friendly to all Southern yards, even the more sensitive St. Augustine varieties. I’ll keep a supply of these packets coming at all times!

Pretty good weed killer, works slow but it works.

DId have some effect on Chamberbitter. Will try again this spring in hope it wipes out this nasty rapidly invasive pest.

We have some very obnoxious weeds that don't respond to standard herbicides. Researching the varieites, it appeared Celcius was probably the best choice. It worked great on the dichondra, but had difficulty with the Dalias Grass (which is almost impossible to kill unless you use round-up). One needs to be careful as it can hurt centipede and zoysia -- we did see a bit of yellowing, and stunted growth for a month or so, but the grass recovered nicely, and 4 months later shows absolutely no sign of damage. Knowing this, I did not want to spray the entire lawn and only wanted to spot kill in the few areas we had problems. Celcius is used commercially a lot, so most offerings were for much larger quanties than I'd ever use, and it is rather expensive. These small packets were a perfect choice.