St. Augustine is a warm season tropical grass with a slightly coarse blade texture. With ample water, fertilizer and proper mowing height it can be maintained with a deep green color. St. Augustine grass is not very tolerant of foot traffic, so it is mainly used on ornamental lawns as opposed to sports fields and areas where activity is heavy. According to Texas A&M University, St. Augustine grass will accept a wide range of soil conditions save waterlogged or very dry drought-prone soils.
Water your St. Augustine grass regularly and deeply, applying a minimum of 1 inch of water each week, in a single session or divided into two sessions. Water considerably more in warm or dry weather and just slightly less in rainy weather. Keep the soil just below the thatch moist at all times.
Mow your St. Augustine grass to a height between 2 and 3 inches for a deep green and lush appearance. This will necessitate mowing every five to 14 days depending on your climate and the time of year. Keep the grass blade length at 3 inches when growing St. Augustine in shade for a deeper green appearance.
Fertilize your St. Augustine grass with a nitrogen-rich lawn fertilizer product once per month from spring through late fall. Apply according to the label dosing directions for your soil type but do not to exceed 1 lb.of fertilizer for every 1,000 square feet of lawn surface each month.
Aerate your St. Augustine lawn once or twice a year to keep the soil from compaction, introduce oxygen to the root zone and prevent excess thatch from building up. Run the aerating tool over the entire surface of the lawn in two passes, the second perpendicular to the first. Clear up the removed soil core with a rake and discard.
Correct iron chlorosis or yellowing of the grass blades growing on alkaline soils above 7.5 pH with spray applications of an iron sulfate product designed for lawn grass. Apply according to the product label directions and repeat as proscribed and needed to control the discoloration.