If Roundup, a post-emergent systemic herbicide, comes in contact with junipers, it can kill them. The Roundup label warns users to keep the herbicide away from foliage, green stems and exposed non-woody roots of any desirable plants or trees.
About this Author
Aileen Clarkson has been an award-winning editor and reporter for more than 20 years, earning three awards from the Society of Professional Journalists. She has worked for several newspapers, including "The Washington Post" and "The Charlotte Observer." Clarkson earned a Bachelor of Arts in journalism from the University of Florida.