Answer: Both Centipede and St. Augustine are warm season grasses and neither needs a fall application of fertilizer. As the temperatures cool down, both will go dormant (Centipede is slightly more cold tolerant so may remain greener longer than the St. Augustine). In the spring, both grasses will green up again. You can fertilize in the spring when the grasses begin growing. If you want a green lawn over the winter months, you can over seed with a cool season annual such as rye. Best wishes with your lawn.
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