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I don't know if this is as popular in other parts of the country, but in this area this is how most newly constructed homes get their lawns--with sod. Unload it and lay it down and instant lawn!
Supposedly, Chattanooga is a difficult area for lawns because our climate is too hot in the summer for cool weather grasses and too cold in the winter for warm weather grasses. So, you can plant either kind but neither one thrives on its own without lots of help.