This plant is one that my husband's Mom brought us from Florida several years ago. It's a Ruellia brittoniana Mexican Petunia. Ours is just starting to bloom this year, and I can see several buds forming. I really like the long, thin foliage, which is attractive without the blooms. The blooms seem to just last a day or so but it looks like there will be a steady stream of them once it starts blooming.
It's tag gives the following information: full sun, hardy to 32 degrees F., medium height, and flowers spring to fall. Care: Dark green foliage with attractive, funnel-shaped, petunia like flowers which bloom from spring to frost. A clump forming perennial to 18"-24" high. Heat tolerant and will tolerate heavy clay soils. Do not over water.
7 years ago