We offer fertilizer treatments 5 times a year. If you do not want them all we recommend 2 to 3 to still have a great lawn. Early Spring, Late Spring, Summer, Early Fall, Late Fall As well as treatments for grubs that can destroy your lawn. The fertilizer treatments are based on the time of year so that it will benefit the plant the most in that stage of its growth. All fertilizer treatments help to control weeds and maintain a vibrant green color.