I am going to be fertilizing quite a few shrubs on a residential property and using a 10-10-10 granular fertilizer. How do I go about putting together a price. Should I count the shrubs and small trees and multiply by x amount of dollars. Not sure how to go about it. Any formulas etc. What should I charge per shrub. All the plant material was planted last spring. Theres about 4 maples about 15ft tall and a cedar hedge etc and other smaller shrubs. Thanks in advanced.