Can lawn pre-emergents be applied now and what is a good brand of emergent to apply in Zone 7 ?
Montgomery County Maryland
We assume you are referring to a crabgrass preemergent. Here is our link that offers tips for application and timing https://extension.umd.edu/hgic/topics/crabgrass
Specifically, I wanted to know about a preemergent for for Japanese Stiltgrass.
We notice that you are located in Montgomery County.
Here is some information from the Montgomery County Dept of Environmental Protection regarding a new law regarding pesticides.