Yes, SedgeHammer Plus Herbicide is safe for centipede grass. Tenacity Herbicide would be a great option for you to control nutsedge without harming your Centipede lawn.
For best results when applying, SedgeHammer Herbicide applications should be made when temperatures are between 60 to 70 degrees or when the nutsedge has reached the 3 to 8 leaf stage of growth. Do not apply when temperatures are above 85 degrees.
SedgeHammer Plus Herbicide does not specifically list pampas grass as a tolerable plant. Please provide what you are trying to treat for so we may advise on your situation.
SedgeHammer Herbicide is not labeled for poa annua. Please see our Poa Control guide below.
https://www.domyown.com/poa-annua-identification-guide-a-569.html
Once mixed, SedgeHammer Plus Herbicide needs to be sprayed within 24 hours for the best potency and effectiveness.
Yes, SedgeHammer + Herbicide can be used on a centipede lawn safely as directed on the product label.
SedgeHammer may not be the best option for you. It is meant more for nutsedge control in turf grass and it cannot be used in or around a vegetable garden or anything edible. It remains in the soil for up to 3 years so the manufacturer recommends that you not plant anything edible in an area where SedgeHammer has been applied for at least 3 years. For nutsedge control in or around a vegetable garden, it is recommended to spot-treat the sedge with a glyphosate or RoundUp-type product directly. With this type of product, it is only necessary to wait 2-3 weeks after application to plant vegetables or anything else. We would recommend Roundup QuickPro 1.5 oz. packs for ease of use.
Also, you should not just pull the plants. This will just split off the rhizome and more new plants will grow from the nutlets left in the soil. To completely remove the plants, you would need to completely dig out the nutlets so that new plants do not grow from them. Many folks will still till the soil after using RoundUp to be sure there are no remaining nutlets that will grow new plants.
Using SedgeHammer Plus Herbicide the nutsedge itself takes about 3-6 weeks to die in some cases, so realistically you could mulch pretty close after if you are mulching over where you applied the Sedgehammer and where the sedge is growing.