ProSedge Herbicide needs to be applied when temperatures are under 85 degrees. Making applications first thing in the morning or in the early evening is a common time. Applying herbicides at temperatures over 85 degrees increases the risk of burning your lawn.
ProSedge Herbicide is mixed with water (and adding a surfactant) and applied to dry grass. You should avoid irrigation/rainfall within 24 hrs following the application.
ProSedge Herbicide 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 anything edible. It remains in the soil for up to 3 years.
When using ProSedge Herbicide you would need to mow at least 2 times before applying it to a newly seeded lawn. It is best to wait until you can mow 3 times.