A standard glyphosate-based broadleaf herbicide is best for box elder, according to the Wisconsin Department of Natural Resources. Kill box elder trees less than 2 feet in height by spraying the herbicide directly onto the foliage. Cut down larger elder trees and allow them to grow several inches of sprouts before spraying with the herbicide.
About this Author
Josh Duvauchelle is an editor and journalist with more than 10 years' experience. His work has appeared in various magazines, including "Honolulu Magazine," which has more paid subscribers than any other magazine in Hawaii. He graduated with honors from Trinity Western University, holding a Bachelor of Arts in professional communications, and earned a certificate in applied leadership and public affairs from the Laurentian Leadership Centre.