 shrubs flowers etc just with the with the vapor so we got to be careful with that this time of year so just get a crabgrass spray follow little directions on the label i like to get the kind you can just put on the end of the garden hose and just open it turn on the water and open up the spray nozzle and just spray it on your yard make sure you get all of it where it covers the surface of the leaves on the crabgrass follow the label directions