Mexican Hardy Petunia

Ruellia x brittoniana

Purple, petunia-like flowers appear continuously throughout the warm season on broad clumps of tall, upright, woody stems with narrow, elongated, dark green leaves. Plant towards the rear of a border or as an accent in a mixed container. Versatile and adaptable to varied conditions, from wet soils to waterwise gardens. An herbaceous perennial.
There are very few rules in gardening, but perhaps the most important one is to work within your zone. Choosing plants that grow and thrive in your particular climate is the very first step toward having a beautiful garden . Learn More

Your climate might be too cold for this plant:


Full sun, Partial sun

Water regularly - weekly, or more often in extreme heat or containers.

No Retailers found within 50 miles of your zipcode

Set Zip to See Prices
More Information
Botanical Pronunciationroo-EL-ee-uh brit-tone-ee-AY-na
Average Size at MaturityModerate growing; reaches 3 ft. tall and up to 3 ft. wide.
Bloom TimeSpring through Summer
Deciduous/ EvergreenHerbaceous
Flower AttributeLong Bloom Season, Showy Flowers
Flower ColorPurple
Foliage ColorDark Green
Garden StyleMediterranean, Rustic
Growth HabitSpreading, Rounded
Growth RateModerate
Landscape UseBorder, Container, Mass Planting, Poolside, Rock Garden, Very Wet Areas, Coastal Exposure, Urban Garden
Light NeedsFull sun, Partial sun
Soil NeedsFlower & Rose Food
Special FeatureClump Forming, Easy Care, Naturalizes Well, Tolerates Poor Soils, Tolerates Wet Soils, Waterwise, Heat Loving
Water NeedsModerate
Watering NeedsWater regularly - weekly, or more often in extreme heat or containers.
Companion PlantsTickseed (Coreopsis); Shasta Daisy (Chrysanthemum); Phlox (Phlox); Coral Bells (Heuchera); Butterfly Weed (Asclepias)

Highly adaptable, but thrives in organically rich, well-drained soil; grows vigorously in wet soils and tolerates moderate drought. Blooms best in full sun. Water deeply, regularly during the first growing season to establish an extensive root system; once established, reduce frequency. Prune back old foliage before new growth emerges in spring.

This Plant's Growing Zones: 8-11

Your USDA Cold Hardiness Zone:

Your climate may be too cold for this plant