I love this plant. This is a Mexican Petunia or Ruellia
It grows in Zones 8-11. It is a perennial that completely disappears in the winter and then reappears in late spring. It was given to me by my friend Linda. “Just pick a few stems and put in the dirt where you want them.” she said and she was right. They wilted for a day or two and then just kept going. This one I found where I had stuck a few stems into the ground last fall. After 30 continuous days of >100 deg. and no supplemental water, my little Mexican Petunia is going strong. This is a closeup but the whole plant is covered with these beauties.