How Much Water Does St Augustine Grass Need?

Watering is a crucial aspect of maintaining a healthy and lush St. Augustine grass lawn. This type of warm-season grass is native to subtropical regions and requires sufficient water to thrive.

The real question is, how much water does St. Augustine grass actually need?

Quick Answer:

St. Augustine grass needs about 1 to 1.5 inches of water weekly, including rainfall and irrigation. Hotter, drier periods may require more. Overwatering, however, can lead to disease. It’s better to water deeply and less frequently to encourage deep root growth.

Factors that influence the watering needs of St. Augustine grass include regional climate, soil type, and the grass’s growth stage.

St Augustine Grass Overview

St Augustine grass is a very popular choice for lawns and turf, particularly in warm climates. This grass variety is known for its lush, green color and rapid growth. It is a low-maintenance option for those looking to create a beautiful and inviting lawn.

One of the reasons for its popularity is its ability to thrive in a wide range of soil types. More importantly, St Augustine grass is highly drought-tolerant, which makes it an excellent choice for areas where water conservation is a concern.

However, like any other grass, St Augustine still requires the right amount of water to stay healthy and maintain its bright green color. Understanding the specific watering needs of this grass variety is important to achieving a thriving and attractive lawn.

In general, this grass type performs best when receiving 1 to 1.5 inches of water per week. This can be supplied by either rainfall or irrigation.

During the summer months, when temperatures rise, and there is less rainfall, it may be necessary to increase the frequency of irrigation.

Here are some useful tips for watering St Augustine grass:

  • Water early in the morning or late in the afternoon to minimize water evaporation.
  • Make sure to water deeply and infrequently, encouraging deeper root growth.
  • Use a rain gauge or moisture sensor to monitor the amount of water applied to the lawn.
  • Adjust the watering schedule based on the season and local weather conditions.

Following these recommendations will help maintain a healthy, green St Augustine lawn that is not only visually appealing but also functional as turf.

Water Requirements and Frequency

Watering St Augustine Grass

Factors Influencing Water Needs

Several factors influence the water requirements of St. Augustine grass, including soil type, climate, and the overall health of the turf.

  • Soil type: St. Augustine grass can grow in various types of soils, from sandy to loamy. However, sandy soils tend to drain more quickly and require more frequent watering to maintain the grass’s moisture levels. Loamy soils, on the other hand, hold water better and require less frequent watering.
  • Climate: Warmer and dryer climates increase the rate of evaporation and the grass’s need for water. Cooler and more humid climates reduce the rate of evaporation, thus decreasing the need for watering.
  • Turf health: Well-established and healthy St. Augustine grass can withstand drought better than new or struggling lawns. A strong root system allows the grass to access water deep in the soil, minimizing the need for additional watering from above.

When determining how much water to give your St. Augustine grass, a general rule of thumb is to provide 1 inch of water per week. This amount should be divided into two separate watering sessions, with each session providing ½ inch of water.

During periods of extreme heat or drought, it may be necessary to increase the frequency to three times per week, giving ¾ inch of water during each watering.

Watering should be done in the early morning hours to minimize evaporation and ensure that the grass has access to the water throughout the day. Watering during the afternoon or evening can lead to disease problems due to the grass staying wet for an extended period.

Here’s a quick reference guide on watering frequency and amounts for St. Augustine grass:

Soil TypeClimateWatering FrequencyWater Amount per Session
SandyNormal2 times per week½ inch
SandyHot3 times per week¾ inch
LoamyNormal1-2 times per week½-1 inch
LoamyHot2-3 times per week½-¾ inch

By maintaining proper watering practices and monitoring the influencing factors, you can ensure your St. Augustine grass stays healthy and beautiful throughout the year.

Irrigation Techniques and Tips

Wet Lawn

Spring and Summer Watering

Watering should be done consistently, at least twice a week, to maintain a healthy lawn. Heavier irrigation is recommended on particularly hot days. To make sure the grass receives enough water, apply about ½ inch of water per session, which can be measured by placing a small container in the watering area.

In order to promote deeper root growth and prevent evaporation, it is best to water the grass during early morning hours. Avoid watering during the afternoon or evening, as this may lead to increased evaporation rates and potential fungal diseases.

Some recommended irrigation techniques include:

  • Using a sprinkler system to evenly distribute water
  • Employing a soaker hose for more targeted, slow-release watering
  • Being mindful of local watering restrictions and following the guidelines set forth by your municipality

Winter Watering

During the winter months, St. Augustine grass becomes dormant and requires less frequent irrigation. Depending on the region and temperature, it may only need watering once every 2-4 weeks.

To prevent over-watering, keep an eye on rainfall levels and adjust the irrigation schedule.  Additionally, use the following tips to promote a healthy lawn during the winter months:

  • Only water when the soil appears dry, and the grass blades start losing their vibrant green color
  • Utilize a rain gauge to ensure the lawn receives about 1 inch of water per month, including rainfall
  • Switch to manual watering, as needed, to better control the amount of water being applied to the grass

Remember, maintaining proper irrigation techniques and watering schedules is essential for a healthy St. Augustine lawn.

By following these tips for spring, summer, and winter watering, a lush, green lawn can be enjoyed year-round.

Maintaining Healthy St Augustine Grass

Proper Mowing Height

Maintaining a healthy St Augustine grass lawn starts with proper mowing. The appropriate mowing height range for St. Aug. is typically between 2.5 and 4 inches. Mowing at the right height promotes a healthy, thick lawn that discourages weed growth and reduces stress on the grass.

  • Mow frequently, ideally every 7 to 14 days in the growing season
  • Keep the mower blades sharp for clean cuts
  • Avoid removing more than one-third of the leaf blade at once


Fertilizing St Augustine grass is crucial for its growth and overall health. Proper fertilization encourages a dense lawn that can outcompete weeds and withstand disease pressures.

Here are a few guidelines for fertilizing:

  • Apply 1 to 2 pounds of nitrogen per 1,000 sq ft annually
  • Use a slow-release fertilizer for consistent nutrient release
  • Apply fertilizer in the spring and fall
  • Avoid over-fertilizing, as it can promote thatch buildup and disease

Disease Prevention

Disease prevention is essential for maintaining a healthy St Augustine lawn.

Here are a few tips to prevent disease in your St Augustine grass:

  • Water your lawn deeply and infrequently, generally 1-inch per week
  • Irrigate in the early morning hours to reduce the length of time the grass remains wet
  • Aerate the soil to improve drainage and reduce soil compaction
  • Quickly address any apparent disease symptoms, such as brown patches, to minimize spread

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