If its pine bark, most likely if its in ST Augustine, then it will take a while to break down and look like crap while doing it.
Smallaxe, the grass grows on long runners 3' or 4' long, makes a real nice web over the entire area. Every 2"-4" it will have roots going down and a crown with nice thick blades. Its a beautiful grass but has alot of issues.
Knowledge is knowing a tomato is a fruit, wisdom is not using it in a fruit salad.