Ruellia humilis - Wild Petunia

This compact, drought-tolerant native is easy to grow and works well in pots. It features tubular, bell-shaped, petunia-like lavender to lilac flowers (to 3" long), each with five shallow rounded lobes. The longer bloom period of May to October makes it a particularly good choice for mixing with other shorter plants for lasting color.
 
Sun to Semi Sun, Average Soil, Spring to Fall, 12-24 in Tall, Zones 4-8