The best fertilizer for both young and established trees is a nitrogen fertilizer, according to the University of Minnesota Extension. Urea, ammonium nitrate, ammonium sulfate and osmocote are beneficial fertilizers for younger trees.
About this Author
Lindsay Champion’s writing has been published in Time Out New York, The New York Press, McSweeney’s, Fray Quarterly and SMITH Magazine. She has written hundreds of health and fitness articles for numerous internet publications. Champion earned her Bachelor of Fine Arts from NYU's Tisch School of the Arts, where she studied writing.