90% of the lawns here in South Carolina are Centipede Turf. Winterizing Centipede requires no nitrogen based fertilizer (it can actually harm Centipede). Potassium fertilizer will aid in root development, reduce stress during winter, and, reduce lawn disease such as Centipede decline.
Use 1 oz. per 1000 sq. ft. It's inexpensive and can be used in conjunction with all Nature's Lawn products.