Dyschoriste linearis
Zone 7a to 9b Native to Texas and Mexico Grows to 1'h x 2'w
Takes full, hot sun in poor soil! Narrowleaf dyschoriste, sometimes called snake herb, is native throughout the state of Texas. It forms a dense mound of upright stems covered with narrow leaves, from which petunia-like purple flowers emerge. Since it's a Texas native it likes it hot and dry, and it will thrive in any well-drained soil.
It says FULL SUN AND AVERAGE water needs.

Does this help yah any?

:) Fran

Thanks, Fran. The plant(s) looks half dead at the moment, but I plan to transplant it into a larger pot. Are you interested in a piece if it begins to grow?