I started with a 6″ almost dead stem and 10 yrs later it is everywhere. It is very easy to maintain – I just snap off pieces to keep it trimmed back. The hummingbirds love it, yesterday I counted 12.

I have also seen this called mexican bluebell. It is a gorgeous, showy, fast-growing plant. I had some in a front bed last spring/summer, and pulled it out because I was told it wouldn’t survive the winter. It must have left runners because this year, I had several new plants where the old ones had been–didn’t bother me at all. You can purchase it at garden centers in the spring. It grows well in semi-shade or direct sun, in pots or in beds. (But beware of the spreading.)

Also known as Ruellia. Keep in mind that it can spread.

Ruellia brittoniana this plant is invasive. Some people say to keep it in a container like bamboo… It’s not a good plant to release on an unwary flower bed. Maybe you could plant a clump in the center of your lawn… and keep the edges mowed.

This appears to be a Mexican Petunia. Buck