Customer wants 21 Tea Olives planted. I mostly mow, edge, trim, mulch, prune but I want to use the job as a learning experience. I don't know how big these trees are but I gotta think small seeing that she's buying 21 of them. I'm wondering what type of fertilizer I should put in the holes when they are planted. Any advice for tree planting would be great. Oh by the way, the area has been marked for utilities.