re: Anyone ever de-thatch St. Augustine lawn?

Early to mid march while grass is still somewhat dormant, cut it low. Actually scalp it some. This will give you access to de-thatch. Next dethatch it with rake or mower attachment until soil is slightly disturbed. Bag all debris removed. Next fertilize with 13.13.13. Wait 30-45 days and fertilize again. Every couple weeks raise your blades another notch. By the heat of the summer you want your blades cutting as high as possible. This provides max shade for the soil and helps hold moisture longer.