Best Fertilizer for Zoysia Grass
Zoysia grass has a lower nitrogen demand than Bermuda grass and is more sensitive to fertilizer application errors, particularly over-fertilization, which drives excessive thatch buildup that is difficult to manage in the dense Zoysia turf structure. A Zoysia fertilizer program is successful when it delivers enough nitrogen to maintain good color and density through the growing season without pushing the aggressive growth that creates a thatch problem.
Zoysia’s Nutrient Needs vs Bermuda
Zoysia grass requires 2 to 3 pounds of actual nitrogen per 1,000 square feet per year, compared to Bermuda’s 3 to 6 pounds. This lower nitrogen demand reflects Zoysia’s naturally slower growth rate. Applying Bermuda-level nitrogen rates to a Zoysia lawn drives excessive shoot growth, rapid thatch accumulation above the optimal 0.5-inch threshold, and increased disease susceptibility in the dense, low-airflow canopy.
Potassium requirements for Zoysia are similar to Bermuda: moderate to high potassium supports stress tolerance through summer heat, and a fertilizer NPK ratio with meaningful potassium (such as 24-0-12 or 20-0-10) suits Zoysia better than a low-potassium product.
Best Fertilizers for Zoysia Grass
Scotts Turf Builder Southern Lawn Food (32-0-10)
Format: Granular NPK: 32-0-10 Nitrogen type: Slow-release polymer-coated
The same product recommended for Bermuda also works well for Zoysia, applied at a lower rate than Bermuda to match Zoysia’s lower nitrogen demand. Using a high-nitrogen product at a lower application rate gives you more control over the total nitrogen delivered per application.
At 2 pounds per 1,000 square feet rather than the Bermuda rate of 3 to 3.5 pounds, this product delivers approximately 0.64 pounds of actual nitrogen per 1,000 square feet, which is appropriate for a Zoysia spring or early summer application.
Andersons Innova Organic Fertilizer (8-1-5)
Format: Granular (organic) NPK: 8-1-5 Nitrogen type: Slow-release organic
An organic slow-release product at the 8-1-5 NPK ratio is well-suited to Zoysia’s lower nitrogen demand. The organic nitrogen releases slowly and steadily, reducing the surge-and-crash cycle that high-rate synthetic applications can create in slow-growing Zoysia. The 1% phosphorus and 5% potassium provide balanced secondary nutrition.
Milorganite (6-4-0)
Format: Granular (organic) NPK: 6-4-0 Nitrogen type: Slow-release organic
Milorganite’s low nitrogen percentage and very low burn risk make it particularly appropriate for Zoysia during summer peak heat, when applying synthetic nitrogen carries elevated burn risk and when Zoysia’s slower growth rate means the lawn does not need aggressive feeding. Applied at standard rate (32 pounds per 5,000 square feet), Milorganite delivers approximately 0.86 pounds of actual nitrogen per 1,000 square feet with no burn risk.
Pennington UltraGreen Southern Weed and Feed (29-0-5)
Format: Granular NPK: 29-0-5 Herbicide: 2,4-D, mecoprop-p, dicamba (labeled for Zoysia)
For spring applications where broadleaf weed control alongside fertilization is desired, Pennington Southern Weed and Feed is specifically labeled for Zoysia and provides a combined treatment. Apply in late spring once the lawn is fully out of dormancy and actively growing. Always verify that the product is labeled for Zoysia specifically; standard weed and feed products formulated for cool-season grasses contain dicamba concentrations that can injure Zoysia.
Zoysia Fertilizer Schedule
Late spring (dormancy break plus 2 to 3 weeks, soil temperature above 65°F): First application of the season. Apply 0.5 to 0.75 pounds of actual nitrogen per 1,000 square feet with a slow-release product. Allow the lawn to reach full active growth before fertilizing to avoid applying to turf that cannot yet process the nitrogen efficiently.
Early to mid-summer (6 to 8 weeks after spring application): Second application. Apply 0.5 to 0.75 pounds of actual nitrogen per 1,000 square feet. This maintains color and density through the peak summer growing season without pushing excessive growth.
Late summer (optional, stop by early September in most climates): A light third application of 0.25 to 0.5 pounds of actual nitrogen per 1,000 square feet using Milorganite or a light slow-release product can support late-season color without delaying dormancy entry.
Fall and winter: No nitrogen applications once Zoysia shows signs of approaching dormancy. Nitrogen at this stage delays dormancy and increases cold damage risk.
Total annual nitrogen: Target 1.5 to 2.5 pounds of actual nitrogen per 1,000 square feet per year across all applications combined. Staying within this range prevents the thatch accumulation that over-fertilized Zoysia is prone to.
Thatch Management on Zoysia
Thatch accumulation is the most common consequence of over-fertilizing Zoysia. A thatch layer above 0.5 inches reduces fertilizer effectiveness, increases disease susceptibility, and causes scalping during mowing. Annual or every-other-year vertical mowing (power raking) removes excess thatch from the dense Zoysia mat and is an important part of long-term Zoysia management when regular fertilization is used.
For more on the dethatching process including timing and equipment, see the dethatching and aeration hub.
Weed Control Alongside Fertilization
Zoysia’s dense growth habit naturally suppresses weeds once the lawn is well-established. However, thin areas and early-season growth before full canopy closure provide opportunities for weed establishment. Weed and feed products labeled for Zoysia address broadleaf weed pressure alongside spring fertilization. For the full guide to compatible weed and feed products, see best weed and feed for warm season grasses.