|how can you tell the what kind of grass do you have?|
I'm not sure how to describe the grasses well enough to help you identify your turf. Basically St. Augustine has leaves that are about 1/3 to 1/2 inch in width. Zoysia comes in a broad leaved type with leaves about 1/4 inch wide and a narrow leaf type with leaves about 1/8 inch wide. Bermuda is also about 1/8 inch wide.
If you pull some of the grass and place it in a zip close bag and then take it to your County Extension Office they can identify it for you.
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