General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Wet Mesic
Dry Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 8a -12.2 °C (10 °F) to -9.4 °C (15 °F)
Maximum recommended zone: Zone 11
Plant Height: 2 to 4 feet
Plant Spread: 2 to 4 feet
Leaves: Evergreen
Other: 6-12 inch long narrow, linear green leaves are often tinged with purple.
Fruit: Dehiscent
Other: 1 inch long cylindrical capsule containing numerous seeds.
Flowers: Showy
Flower Color: Lavender
Bloom Size: 2"-3"
Flower Time: Late spring or early summer
Late summer or early fall
Year Round
Underground structures: Rhizome
Suitable Locations: Xeriscapic
Bog gardening
Uses: Provides winter interest
Will Naturalize
Wildlife Attractant: Bees
Resistances: Deer Resistant
Rabbit Resistant
Humidity tolerant
Drought tolerant
Propagation: Seeds: Other info: Self seeds prolifically.
Propagation: Other methods: Division
Other: Dividing rhizomes.
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Awards and Recognitions: Texas Superstar®

Common names
  • Mexican Petunia
  • Desert Petunia
  • Florida Bluebells
  • Mexican Blue Bells
  • Dwarf Mexican Petunia
Botanical names
  • Accepted: Ruellia simplex
  • Synonym: Ruellia coerulea
  • Synonym: Ruellia brittoniana
  • Synonym: Ruellia tweediana

Photo Gallery
Location: Ingleside. Illinois
Date: 2022-08-23
Location: Sebastian,  Florida
Date: 2019-03-11
Location: Plano, TX
Date: 2017-05-30
Location: Beautiful Tennessee, my garden
Date: 7-8-2017
Location: South Florida
Date: Summer 2012
Mexican Petunia aka Purple Showers
Location: Longwood Gardens in southeast Pennsylvania
Date: 2014-10-03
one plant used as an annual with other annuals

Date: 2018-05-16
Location: Ingleside. Illinois
Date: 2023-05-26
Location: Lauderdale-by-the-Sea, Florida
Date: 2018-04-03
a groundcover in a planting island at a shopping mall

Date: 2021-09-04
Location: Columbus, OH
Date: 06-08-2002
Location: Beautiful Tennessee, my garden
Date: 7-7-17
Location: Toronto, Ontario
Date: 2022-08-10
Mexican Petunia (Ruellia simplex).

Date: 2017-10-12
Location: Grapevine, Texas USA
Date: 2022-7-14

Date: 2021-09-04
Location: Kyle
Date: 2018-09-07
Location: Sea World San Antonio, San Antonio, Texas
Date: 2022-04-03
sorry bad framing

Date: 2018-11-27
Location: Cypress Gardens, Florida
Photo by sedumzz

Date: 2013-08-14
Location: Toronto, Ontario
Date: 2022-08-10
Mexican Petunia (Ruellia simplex).

Courtesy Outsidepride
  • Uploaded by Joy

Date: 2013-09-12
Location: Sebastian, Florida
Date: 2017-07-13
Location: Sebastian, Florida
Date: 2017-01-27
Location: zone 8 Lake City, Fl.
Date: 2012-07-30
Location: Grass Roots Nursery, New Boston, MI
Date: 2009-07-15
Photo by sedumzz
Location: Waynesboro MS
Date: 2011-08-26
pink viriety
Location: Plano, TX
Germinated in 4 days.
Location: Beautiful Tennessee, my garden
Date: 2017-08-18
Location: Plano, TX
Location: Plano, TX
Date: 2013-10-12
Location: Texas
Mexican Petunia

Date: 2013-08-14
Location: Sebastian, Florida
Date: 2016-10-17

Date: September
credit: Prenn
Location: Beaumont botanical garden 
Date: 2017-10-13
Location: mom's garden 
Date: 2014-08-26
Location: My garden, Cottage-in-the-Meadow Gardens in South Amana, IA

Date: 2013-09-12
Location: zone 8 Lake City, Fl.
Date: 2012-07-30
Location: zone 8 Lake City, Fl.
Date: 2012-07-30
Location: zone 8 Lake City, Fl.
Date: 2012-07-30
Location: Sebastian, Florida
Date: 2016-11-04
Location: Telly's Greenhouse, Troy, MI
Date: 2008-08-18
Location: Wayneboro MS
Date: 2008-11-19
Location: Plano, TX
Date: 2013-10-12

Date: 2013-08-14
Location: Plano, TX
Date: 2016-10-07
Location: Sebastian, Florida
Date: 2016-10-17

photo credit: Jeevan Jose, Kerala, India
Location: Sebastian, Florida
Date: 2016-10-22
Location: my garden 
Date: 2014-07-10
Location: Fountain, Florida
Date: 2012-06-30
Location: Fountain, Florida
Date: 2012-06-30
Location: Fountain, Florida
Date: 6-30-2012
Location: zone 8 Lake City, Fl.
Date: 2012-07-30
Location: Plano, TX
Date: 2013-10-10
Location: Grass Roots Nursery, New Boston, MI
Date: 2009-07-15
Location: Grass Roots Nursery, New Boston, MI
Date: 2009-07-15
Location: Telly's Greenhouse, Troy, MI
Date: 2008-08-18
This plant is tagged in:
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  • Posted by plantladylin (Sebastian, Florida - Zone 10a) on Jan 27, 2017 1:32 PM concerning plant:
    Although Ruellia simplex has lovely blooms, due to its invasive tendencies it is not a good plant for Florida gardens. We moved into our current home nine months go and I've been trying to eradicate this plant from two separate areas of my yard ever since. It is a difficult task to remove and must be dug up due to the fact that that it travels via underground rhizomes; if you try to pull it by hand, the stems break off and you are still left with pieces of rhizomes in the soil. Mexican Petunia is a popular landscape plant because it is a prolific bloomer, it tolerates many different landscape conditions, from shade to sun, and it even thrives in poor soil. The plant is listed by the FEPPC (Florida Exotic Pest Plant Council) as a Category I invasive here in the state. To deter its spread, it is best grown in containers in Florida.
  • Posted by LarryR (South Amana, IA - Zone 5a) on Sep 30, 2012 11:06 AM concerning plant:
    I grow this plant in a pot in Iowa, where it has zero chance of escaping.
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Apr 7, 2022 11:24 AM concerning plant:
    This evergreen perennial that can eventually become semi-woody in stems is native to Mexico, Central & South America, and the Caribbean. I've seen it planted around in some places in Florida, where it is good for parking lot islands. It makes a good annual in the North and is occasionally sold at some larger, diverse garden centers. Each of its purple petunia-like flowers bloom for less than one day. It has opposite, lanceolate, willow-like leaves about 6 to 12 inches long. It bears tiny bean-like pods about 1 inch long that explosively dehisce sending mature seed in all directions, and is powerfully self-sowing, just like northern species of the Wild Petunias. Fast and easy to grow. It sends out rhizomes (underground stems) to spread more. The cultivar of 'Purple Showers' is sterile and is better to use to not send out seed.
  • Posted by theprynce (Myrtle Beach, SC - Zone 8b) on Oct 29, 2015 12:45 PM concerning plant:
    I have had them in a container with a Black Diamond crepe myrtle for two years now. They died back last winter and got a much later start than I expected.

    Fortunately, I decided to see whether it could be propagated from cuttings and it can! I took four cuttings and they all have roots coming in within a week of floating in water! I'm really stoked about using these as mothers to get more mature plants in other containers as soon as it's safe to set them out next year!
  • Posted by Dutchlady1 on Sep 23, 2011 10:09 AM concerning plant:
    While attractive, this is a Category 1 invasive plant in Florida. It has been used extensively in landscaping, which is now heavily discouraged.
  • Posted by MamaIve12 (Florida - Zone 10b) on Jul 25, 2012 5:56 AM concerning plant:
    This plant produces plenty of flowers and is pretty much maintenance-free. It can be planted in the ground or in containers. Enjoys full sun.
  • Posted by flaflwrgrl (North Fl. - Zone 8b) on Aug 28, 2012 8:06 PM concerning plant:
    There is a petunia native to Florida that is a much better choice than Ruellia tweediana. The native is Ruellia caroliniensis
    Carolina Wild Petunia (Ruellia caroliniensis subsp. caroliniensis)

    This R. tweediana is one tough cookie to get rid of. And if you think you can control it --- well, you might want to think again. It spreads willingly by seeds, which have no dormancy mechanism, and also by rooting wherever the stems touch the ground. It will also send runners underground. It may be pretty and it may be drought tolerant, as well as able to grow in wetlands, but it is also an invasive nightmare.
    This has become a problem in many states; not just Florida.
Plant Events from our members
lovesblooms On February 11, 2015 Seeds sown
winter sown
antsinmypants On August 10, 2022 Bloomed
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
take care to contain this plant by Dutchlady1 Aug 29, 2012 9:03 AM 6
My Mexican Petunia by MsPalm Dec 10, 2015 2:20 PM 2

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