Mexican Petunia is very popular and may be grown in bog gardens, on the margins of ponds, and in beds and borders. It may also be used as a container plant on patios or as a houseplant.The plant typically grows to 3 to 4 feet tall in the wild, but only to 2 or 3 feet tall in gardens. It has linear, dark green leaves that may be tinged with purple The vibrant colored flowers make this an attractive plant.