Mexican Petunia, Mexican Blue Bells, Florida Blue Bells, Desert Petunia, Etc.
Synonyms of Ruellia simplex (9) (updated 11-22-20): Arrhostoxylum microphyllum Nees, Cryphiacanthus angustifolius Nees, Ruellia brittoniana Leonard, Ruellia coerulea Morong, Ruellia ignorantiae Herter, Ruellia longipes Urb., Ruellia malacosperma Greenm., Ruellia spectabilis Britton, Ruellia tweedyana Griseb.
Ruellia simplex C.Wright is the correct and accepted scientific name for this species of Ruellia. It was named and described by Carlos (Charles) Wright in Flora Cubana in 1870.
Ruellia brittoniana Leonard was named and described by Emery Clarence Leonard in the Journal of the Washington Academy of Sciences in 1941. Ruellis brittoniana is a synonym along with seven other scientific names for this species.
The genus, Ruellia Plum. ex L., was described by Carl von Linnaeus in Species Plantarum in 1753 citing a previous description by Charles Plumier. It seems sometimes when I see the “ex” I have to refresh my memory as to its meaning.
Plants of the World Online currently lists 361 accepted species in the Ruellia genus (as of 11-22-20 when I am updating this page). Ruellia is a member of the Acanthaceae Family with a total of 207 genera. Those numbers are likely to change as updates are made and are based on figures from Plants of the World Online by Kew.
There are several links at the bottom of the page for further reading.
My Ruellia simplex (Mexican Petunia) was given to me by my good friend and fellow plant collector, Walley Morse, of Greenville Mississippi. He brought me a nice pot full in the fall of 2011. I kept them inside in the sunroom over the winter then transplanted them along the wall next to the east sunroom. I decided that the area was too shady, so I moved them to the bed next to the west sunroom.
I planted them in several spots and they did very well.
Origin: Mexico, South America, and the Caribbean
Zones: USDA Zones 8a-11 (10 to 40° F)
Size: 36-48” tall
Light: Sun to part shade
Soil: Average to moist, well-drained soil.
Water: Average to wet.
Notes: Can be used as a marginal water plant.
I really like their very dark green, lance-shaped leaves with kind of a corrugated look. They can produce blue, purple, pink, or white flowers. Unfortunately, the only thing I didn’t like about mine was their pink flowers. I guess when Walley found his start he didn’t have a choice.
<<<<2013 IN MISSOURI>>>>
I sold the mansion in Mississippi and moved back to the family farm in mid-Missouri in February 2013. I gave up around 200 potted plants but brought quite a few with me, including all of the Mexican Petunia.
I planted two of the pots in the bed on the south side of the house. One on each side of the downspout on the southwest corner.
I planted the third pot in front of the chicken house…
The Ruellia simplex is native to Mexico, South America, and the Caribbean. They are perennial in USDA Zones 8a-11 and Florida has listed them as an invasive species.
The Ruellia simplex is not very particular about their soil. Although they will do well in average, well-drained soil, they also do fine in wet soil. Well established plants also have a moderate amount of drought tolerance.
They will grow in sun to part shade but produce more flowers in full sun. After they flower you can cut the plant back to encourage them to flower again.
Ruellia simplex can spread aggressively by underground rhizomes and from self-seeding. If it likes you and its conditions, be prepared…
The plants on the right and left of the Mexican petunia are Talinum paniculatum (Jewels of Opar) which were also given to me by Walley Morse.
I knew it would happen sooner or later but I wasn’t sure when. I had been away from here for many years. Mississippi didn’t get a frost until December, so October 25, 2013, was like a shock!
I was somewhat prepared, though… Knowing the Ruellia simplex wasn’t cold-hardy here, USDA zone 6, I had already dug several pots and put them in the shed. I left the one clump in the south bed to see what would happen. Umm… I am writing this page on March 14, 2018, and I am a bit confused… I thought I brought three pots from Mississippi and there seem to be four or five pots in this photo. Hmmm… Maybe some of the clumps were too big for one pot.
Anyway, after a while, I moved these pots to the basement. They didn’t like that too well either.
It seems I learned a valuable lesson with the Mexican Petunia. The clumps I dug didn’t make it and I was surprised the clump I didn’tdig up did. It did very well through the summer of 2014 but didn’t return in the spring of 2015.
When I took a few excess plants to Wagler’s Greenhouse on September 9, 2018, we were talking about plants and somehow the subject about Mexican Petunias came up. She said she had a few that she had had for a while. I told her I had brought some back from Mississippi but they didn’t work out here. I asked her what color the flowers on hers were and she said blue. She asked if I wanted a start, and of course, I said yes. She went to the bed where hers were, went inside and got a shovel, and proceeded to dig a few of the newer offsets. Their roots go pretty deep but she manages to get some that had a few roots. It was funny how she was digging with the shovel barefooted (she is Amish and women and children are pretty much always barefooted).
I brought them home and put all the three offsets she gave me in the same pot. It was September 9 already and I didn’t think they would make it through the winter in the ground. Since I had overwintered the plants Walley had given me inside in 2011, I figured they would here as well.
Still looking good on October 10, 2019. That was the day I moved all the potted plants into the house because an “F” was in the forecast.
The Ruellia simplex did just fine in my bedroom over the winter waiting for spring so it could be in the ground outside.
When temperatures permitted, I planted the Ruellia simplex along the right side of the porch in the north bed. They are doing fine, but a few of the plants want to lean so I didn’t get them all in this photo.
Looks like a hungry grasshopper stopped by for lunch…
A very interesting point I must make… The leaves on the Ruellia simplex Mrs. Waglar gave me are much larger than the plants from Mississippi. Nor are these leaves “puckered”.
I have seen a few buds but no flowers…
These leaves are very long for sure…
I decided to put a few rocks against the stems to hold them up.
Even without flowers, Ruellia simplex is one of my favorite perennials. I really their dark green lance,-shaped leaves.
As you can see, if you compare these leaves with the plants from Mississippi, there is no puckering…
I am not sure what keeps happening with the buds. It seems like I see them but then they disappear…
I know I sometimes get a little carried away with photos… But, as long as we are here, the Lysimachia nummularia ‘Goldilocks’ have spread very well this past summer. I also planted a Colocasia ‘Coffee Cups’ which has also done very well.
Ahhh… Finally flowers. Such a nice color compared to pink… The flowers are also much larger than the plants from Mississippi. Hmmm…
It is very interesting growing these plants from Mrs. Wagler. It makes me wonder a few things because of the differences from the Mississippi plants. Larger and longer leaves with no puckering and larger flowers are the main differences. Not to mention Mrs. Wagler has had hers for several years in zone 6 and Ruellia simplex aren’t supposed to be hardy above 8 (7 with mulch).
There are a lot of buds so more flowers are on the way.
In the south, Ruellia simplex is considered very invasive, which I have witnessed first hand. That is not a problem here. The trick is to get them to survive the winter. I put them on the north side in this particular location because the south side is more open and gets a lot of wind. Even so, when it warms up and freezes off and on over the winter it is not good for some perennials either.
Mexican Petunia can be overwintered inside as stem cuttings or by digging a few offsets like Mrs. Wagler did. I had been thinking I should do that, and planned to, but failed to do so…
I had to move the potted plants inside for the winter on October 11 because an “F” was in the forecast for that night. While I should have either taken cuttings or dug a few offsets, or both, I only took photos…
So far, this winter has been very mild so hopefully, the Ruellia simplex will return in the spring of 2020.
I hope you enjoyed this page and maybe found it useful. If you have any comments, questions or suggestions, I would like to hear from you. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant.