From the Annals of Heraldry –  In 1839, the Congress of the Republic of Texas adopted the Texas coat of arms.  The herald is a circular shield with a white five-pointed star on an azure ground surrounded by olive and live oak branches.  Upon statehood in 1845, the designation was altered from the Republic of Texas to the State of Texas.

Red understands the live oak branch and realizes that some now claim to make Texas olive oil, but it seems like a strange choice at the time.