St. Augustine Watering Guide
Target 1.0-1.5 inches per week from irrigation plus rainfall. Sandy Florida soils may need up to 2 inches per week due to rapid drainage. St. Augustine has the shallowest root system of warm-season grasses at roughly 12 inches, making it the first to show drought stress — leaf blades fold in half lengthwise and footprints remain visible. Water in the early morning (before 10 AM) to allow blades to dry before nightfall. Evening watering promotes fungal disease. Deep infrequent watering (2-3 times per week) beats daily light irrigation for root development.
Frequently Asked Questions
How much water does St. Augustine need?
1.0-1.5 inches per week on most soils. Sandy Florida soils may require up to 2 inches per week because water drains through quickly. Water deeply 2-3 times per week, not daily.
When should I water St. Augustine?
Early morning only — before 10 AM. Evening watering leaves blades wet overnight, which promotes fungal disease. Morning watering allows blades to dry during the day.
How do I know if my St. Augustine needs water?
Look for a blue-gray color shift and footprints that stay visible after walking on the lawn. These are the first signs of wilt. Water within 24 hours of seeing these signs.
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