Happily, Ruellia nudiflora (Violet ruellia), is native to Arizona, so we can go to our webpage on that plant (by following the plant link above) to get information on propagation, bloom time and care, etc. From the Conditions Comments on that page is this line:
"Cut back after each flush of blossoms to keep compact and blooming all summer."
You can read the Propagation Instructions on that page, although it does not address growing the plant in a pot. If you are confined to pot gardening, you might read our How-To Article on Container Gardening with Native Plants for some more ideas on how to handle plants grown in this manner. If for the impact of a full pot if for no other reason, we believe we would populate each pot with plants that are in the same stage of development. Propagating several small plants in one pot and then transplanting them to a larger pot would probably be more satisfactory than having the new seedlings and established plants sharing space.
More information from Southeastern Arizona Wildflowers.