Fertilized Magnolia and Carrotwood Trees

Last week I had an arborist out to look at a very sad looking Carrotwood tree in the backyard.  The Magnolia in the front needs a tiny bit of deadwooding.  But that Carrotwood is a mess, so we shut off one sprinkler that was hitting the trunk, removed from rocks that were too near the trunk, took out a pampas grass that limiting airflow, deeply watered and fertilized.  DH cleaned out the garage and found some ancient (>10 years old) Osmocote and Miracle Grow, so I used that on both trees figuring that since I didn't plan to eat either it would be okay.