False Rosemary AKA Scrub Mint (Conradina canescens)

 I have to be planted in the sun in sandy soil .
  
I do not need extra water. 
  
Size:     2 ft tall x 2 ft wide

Bloom Time: Spring, Summer       

I thrive on neglect in sandy soil. I smell wonderful and am a great addition to a wildflower garden. The bees and butterflies love my little purple blooms. Do not give me too much water after I’m established because I will rot and die.

http://florida.plantatlas.usf.edu/Plant.aspx?id=645