Above all, avoid fertilizer "spikes" when caring for evergreen trees. Mature trees don't need much in the way of special feeding, but new and young arborvitaes appreciate either an annual application of Miracle-Gro or an organic alternative such as a manure-bone meal combination.
About this Author
Melissa Jordan-Reilly has been a writer for 20 years, both as a newspaper reporter and as an editor of nonprofit newsletters. Among the publications in which she has published are, "The Winsted Journal," "Taconic" and "Compass Magazine." A graduate of the University of Connecticut, Jordan-Reilly also pursues sustainable agriculture techniques and tends a market garden at her Northwestern Connecticut home.