Certain hardy grasses like zoysia can survive without fertilizer. But they won't thrive. If you want your lawn to be lush and enviable, you must fertilize it. However, zoysia grass needs less fertilizer and fewer applications than other types of grass. One application of fertilizer in summer is enough. Over-fertilizing zoysia is a waste of money. And too much nitrogen can leave the grass susceptible to disease and infestation.
Take a sample of soil, taken from several areas underneath your lawn, to your local county extension office or gardening center for testing. All zoysia grass has the same nitrogen needs. But you may need to adjust your fertilizer to compensate for any other mineral deficiencies in your soil.
Spread 2 pounds of actual nitrogen per 1,000 square feet of lawn with a broadcast spreader. For lawns growing on healthy soil, use a commercial lawn fertilizer with an NPK ratio of 3:1:1. However, if your soil test reveals that your soil is deficient, adjust your fertilizer in accordance with the results.
Water your lawn with 1 to 2 inches of water immediately after you fertilize the lawn.