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That has more to do with lack of prosperity in those cities than with the climate. Those cities (especially Brownsville) are quite poor, and, thus, can't afford fancy landscaping plants like places in Florida can.
Although both cities don't have the rainfall that Miami does, they do have the humidity/low-level moisture, which minimizes evapotranspiration stress on plants. As a result, you will see live oaks like this near Corpus (Goose Island):
And, desalination of the Gulf can provide both cities all the water they need.
C'mon, man. You know I know what these areas look like. I'm not saying Brownsville is dry as Lubbock, but it's not South Florida either.
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