Care advice here applies mainly to Ruellia simplex, commonly called Mexican petunia, Mexican bluebell, or Britton’s wild petunia—not to every plant in the Ruellia genus. Before planting, identify the species and check local invasive-plant guidance: wild-type R. simplex is classified as invasive in Florida.
Identify the Ruellia before choosing a care routine
“Ruellia” is a genus, not a single plant with one set of growing requirements. The recommendations below are for Ruellia simplex; NC State Extension also lists the older name Ruellia brittoniana. Confirm the plant’s identity before using this care profile. NC State Extension’s profile covers the species and its growing conditions.
Check whether it is suitable to plant in your area
In Florida, UF/IFAS classifies wild-type R. simplex as invasive and does not recommend it for use anywhere in the state. It spreads through lateral roots and abundant viable seed. UF/IFAS consumer guidance advises avoiding Mexican petunia unless selecting a cultivar specifically tested as non-invasive; ‘Purple Showers’ is one example, and the broader assessment says certain evaluated cultivars were approved for use with caution in Florida. That guidance does not establish that every cultivar is harmless or indicate the plant’s status elsewhere. Check local invasive-plant and nursery guidance before buying or planting. UF/IFAS’s assessment and its Mexican petunia guidance explain the Florida-specific advice.
Florida readers can also consider the native Ruellia caroliniensis alternative mentioned by UF/IFAS, while confirming local suitability and availability. In other regions, do not assume Florida’s designation applies; seek guidance for your locality.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →#1 Best Overall
- Please note that 2 plants are planted together so you will be receiving 6 sets for a total of 12 plants.
Choose a suitable site and soil
Light
Full sun supports the best flowering. R. simplex can also tolerate partial shade, according to NC State Extension.
Soil and moisture
For growth, provide fertile, well-drained soil with medium to wet moisture. The species tolerates boggy conditions and a range from wet to dry; established plants also tolerate drought. These tolerances describe R. simplex and should not be applied to Ruellia species generally.
Rank #2
- What You Will Receive: You will receive a Pack of 2 healthy, well-rooted 'Purple Showers' Ruellia starter plants, each currently 5-9 inches tall. Shipped bare-root for maximum vigor, these starts are ready to explode with growth, rapidly reaching mature heights of 3-4 feet to fill vertical spaces in your landscape.
- Vertical Drama & Deep Color: Add height and elegance to your garden backdrop. Unlike the dwarf groundcover varieties, 'Purple Showers' stands tall (3-4 feet) with willow-like foliage and large, deep violet trumpet flowers. It provides constant blooms from spring to frost, creating a stunning purple haze that sways in the breeze.
- The "Indestructible" Landscape Solution: Stop replacing dead plants. This is widely considered one of the toughest perennials available. It thrives in the extremes—loving soggy soil in rain gardens and pond edges, yet equally capable of surviving severe drought and baking heat once established in a xeriscape.
- Eco-Friendly & Non-Invasive: Enjoy the beauty of the Mexican Petunia without the worry. 'Purple Showers' is a sterile cultivar, meaning it focuses all its energy on blooming rather than producing seeds. It won't take over your yard or spread unwanted seedlings like the wild species, making it a responsible choice for eco-conscious gardeners.
- Pollinator Haven & Deer Resistant: Create a wildlife sanctuary that pests ignore. The large purple trumpets are a favorite nectar source for Swallowtail butterflies and hummingbirds. Meanwhile, the tough, upright stems and foliage are deer-resistant, keeping your garden looking lush and uneaten.
Climate
NC State Extension lists USDA hardiness zones 8–10 for R. simplex. In colder climates it can be grown as an annual. This hardiness information is for this species, not the genus as a whole.
Support flowering and manage growth
In the NC State Extension profile, R. simplex blooms from summer into fall, although each flower is short-lived. Cutting stems back after flowering may encourage new flowers.
Recommended Free Tools
Rank #3
- Set of 4 live plants: 4 Mexican Petunia starter plants, approximately 3-6 inches tall
- Vibrant flowers: Produces colorful blooms from spring to fall that bring vibrant color and a graceful look to outdoor garden spaces.
- Easy outdoor care: Performs well in full sun to partial shade with well-draining soil and regular watering during establishment and active growth.
- Ideal for flower beds, borders, patio containers, balconies, and mixed landscape displays where colorful flowering plants are desired.
- USDA Hardiness Zone: 8-11
Plan for spread as part of routine care. The plant can spread by seed and rhizomes, so monitor for seedlings and growth beyond the intended area. NC State lists container and patio use, but a pot is not a guarantee of containment: rhizomes can escape through drainage openings, and seed can disperse.
Propagate only where planting is appropriate
Cuttings, division, and seed are listed propagation methods for R. simplex. Before multiplying or sharing it, check regional suitability and consider its ability to spread by seed and rhizomes. Propagating a plant does not make it suitable for a location where it is invasive.
Rank #4
- Mexican Petunia Purple delivers nonstop purple blooms on upright stems with deep green leaves for vibrant garden color all season long
- Ruellia brittoniana thrives in full sun or part shade making it ideal for southern landscapes perennial beds and container gardens
- Produces trumpet-shaped purple flowers and vertical foliage texture perfect for mixed borders walkways or mass plantings
- Heat tolerant perennial spreads steadily forming lush clumps that fill gaps and soften hardscapes with bold tropical character
- Grows easily in various soil types and is a great low-maintenance choice for colorful groundcover and reliable landscape structure
Remove unwanted plants thoroughly
Where control is needed, removing only the tops may leave underground material that resprouts. UF/IFAS guidance emphasizes removing vegetative material completely. For large infestations, seek local extension advice on management. See the UF/IFAS Extension guide to Mexican petunia for information on ecological impacts and control.
Quick Recap
Best Value
- VIBRANT YEAR-ROUND PURPLE BLOOMS: Ruellia is famous for its prolific, trumpet-shaped violet flowers that bloom continuously from spring through fall. It adds a constant splash of "royal purple" to your landscape that outlasts typical seasonal annuals
- RAPID GROWTH & VERTICAL INTEREST: Reaching up to 2-3 feet tall, this "Purple Showers" variety provides immediate height and texture. It’s the perfect choice for filling empty garden gaps, creating lush borders, or adding a "thriller" element to large patio containers
- POLLINATOR MAGNET: Turn your backyard into a nature sanctuary. These nectar-rich blooms are irresistible to hummingbirds, butterflies, and bees, providing a vital food source while bringing lively movement to your outdoor living space
- TOUGH & DROUGHT-TOLERANT: Once established, Ruellia is incredibly resilient. It thrives in the heat, stands up to humidity, and can handle periods of drought, making it ideal for southern climates or busy gardeners who want maximum beauty with minimal watering
- VERSATILE LANDSCAPE OR HOUSEPLANT CHOICE: Ideal for borders, containers, or as a lush indoor accent, this adaptable plant adds beauty and greenery to both modern and traditional spaces
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
