Best Fertilizer for St. Augustine Grass
St. Augustine grass needs 15-0-15 or a similar formula with moderate nitrogen, no phosphorus, and high potassium. Apply 2-4 lbs of nitrogen per 1,000 sq ft per year, split into 3-4 applications from spring through early fall. Use slow-release nitrogen exclusively, St. Augustine is very sensitive to fertilizer burn. Iron chelate supplements improve color without burn risk.
What You Need to Know
St. Augustine grass needs 15-0-15 or a similar formula with moderate nitrogen, no phosphorus, and high potassium. Apply 2-4 lbs of nitrogen per 1,000 sq ft per year, split into 3-4 applications from spring through early fall
Use slow-release nitrogen exclusively, St. Augustine is very sensitive to fertilizer burn. Iron chelate supplements improve color without burn risk.
For personalized recommendations based on your specific garden size and fertilizer, use our fertilizer calculator.
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