The University of Hawaii Extension Service recommends applying Casoron, a liquid formulation of dichlobenil, during cooler weather to control weeds around junipers. Or, use herbicides specific to grasses, such as those containing fluazifop, sold as Fusilade or Ornamec, or sethoxydim, sold as Arrest, to kill weeds. Protect the junipers from the spray with a cardboard shield as an extra precaution.
About this Author
Rogue Parrish has written two travel books and edited at the "The Baltimore Sun," "The Washington Post" and the Alaska Newspapers company. She began writing professionally in 1975. Parrish holds a summa cum laude Bachelor of Science degree in journalism from the University of Maryland.