Some general information I found Dallas lawn Care about St Augustine. Hope it helps

For the grass to change green rapidly, apply a fertilizer that's made up of fast-release nitrogen (apply using a fertilizer spreader).

When you mow your St. Augustine grass, don't mow too closely. Why? If the grass is too short, St. Augustine grass can become weakened and prone to weeds. If you live in an area where there is a shortage of rainfall, don't cut the grass altogether, as this can add additional stress.