How to Fertilize St. Augustine Grass

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St. Augustine grass grows well all over the world and is known by many different names in different countries. It is well adapted to warm, coastal areas and deals well with higher summer temperatures. Fertilizing St. Augustine grass is not unlike fertilizing any other turf grass variety. Granular fertilizers with a high nitrogen content should be applied in early spring, and reapplication should take place every four to six weeks. If the turf grass has been neglected, opt for a starter fertilizer in the spring and a regular fertilizer for the remainder of the summer.

Things You'll Need

  • Granular fertilizer
  • Broadcast or drop spreader
  • Water
  • Wait until the soil temperature is at or above 65 degrees Fahrenheit before preparing to fertilize St. Augustine grass. A good indication that the soil might be warm enough for fertilizer is that 50 percent or more of the grass will be green.

  • Choose a granular fertilizer to apply to St. Augustine grass. Granular fertilizers stay in the soil longer than liquid fertilizers and have to be reapplied less often.

  • Choose either a broadcast spreader or a drop spreader for applying the fertilizer. Either spreader type will apply granular fertilizer evenly.

  • Fill the spreader hopper with fertilizer and set the spread rate according to the recommendation for the spreader model you are using.

  • Walk behind the spreader at a brisk pace, especially when using a broadcast spreader. Begin by fertilizing the perimeter of the St. Augustine grass and finish by covering the middle section one pass at a time.

  • Apply more fertilizer by making a second, perpendicular pass with the spreader. This second pass will ensure that the coverage gained is even over the whole area. Apply 1/2 inch of water to the grass after applying fertilizer.

  • Reapply fertilizer to St. Augustine grass every six weeks until mid-September. Do not apply fertilizer after this point.

Tips & Warnings

  • Use a fertilizer with a high percentage of nitrogen that includes iron. Use a fertilizer that treats insects at the same time during the warmer summer months. Regular fertilizing will help increase the density of the grass and will help keep the turf weed-free.

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