Combined fertilizer and pesticide products are not recommended as it spreads pesticides over the entire surface of your lawn. The City has information about controlling pests and weeds using integrated pest management practices in Control pests & weeds under the Residents tab.
Too much fertilizing can lead to thatch build-up. One of the best ways to fertilize your lawn and help the environment is to leave your grass clippings on your lawn (also known as grass cycling.) Grass clippings are a free source of nitrogen for your lawn, and can provide about 30% of your lawn needs.
You can also topdress your lawn with compost or sterile, aged cattle or sheep manure to provide nutrients.