Answer: Hi-Yield 2, 4-D Selective Weed Killer can be harmful to junipers. Your best option is to try to spot treat with Roundup.

Will 2,4-D kill juniper?

Yes, spraying with a 2,4-D containing compound will damage the junipers, as would using any type of non-selective herbicide such as glyphosate.

How do you keep weeds out of a Blue Rug juniper?

Weeds in blue rug juniper can also be managed with spot treatments of imazaquin herbicides. This method is easiest when only a few weeds exist. Use a backpack or handheld sprayer filled with a solution of 3/4 teaspoon of herbicide and 1/2 teaspoon of surfactant in 1 gallon of water.