Timothy from Washington State writes
Typically you would not apply a pre emergent and a post emergent at the same time, since the times of year for each to work best are opposite from each other. Sedge is typically better controlled by spot treatments rather than broadcast applications, and Sedgehammer requires the use a surfactant whereas Prodiamine does not. Prodiamine is also usually applied with a higher water volume per square footage since you want to water it in to create a wall-like barrier in the soil for prevention.
Answer last updated on: 08/20/2021
