North America Native Plant

Carolina Wild Petunia

Botanical name: Ruellia caroliniensis ciliosa var. cinerascens

USDA symbol: RUCAC5

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Ruellia ciliosa Pursh (RUCI4)  âš˜  Ruellia ciliosa Pursh var. cinerascens Fernald (RUCIC)  âš˜  Ruellia humilis sensu Small, non Nutt. (RUHU6)   

Carolina Wild Petunia: A Lesser-Known Native Wildflower If you’re looking to add authentic southeastern charm to your native garden, you might want to get acquainted with Carolina wild petunia (Ruellia caroliniensis ciliosa var. cinerascens). This particular variety of the beloved Carolina wild petunia represents one of nature’s more subtle offerings ...

Carolina Wild Petunia: A Lesser-Known Native Wildflower

If you’re looking to add authentic southeastern charm to your native garden, you might want to get acquainted with Carolina wild petunia (Ruellia caroliniensis ciliosa var. cinerascens). This particular variety of the beloved Carolina wild petunia represents one of nature’s more subtle offerings – a plant that doesn’t shout for attention but quietly contributes to the native ecosystem.

What Exactly Is This Plant?

Carolina wild petunia var. cinerascens is a perennial forb, which is botanist-speak for a soft-stemmed plant that comes back year after year without developing woody growth. Think of it as the herbaceous cousin in the wild petunia family tree. This variety has earned its place in botanical collections under several historical names, including Ruellia ciliosa and Ruellia humilis, showing just how much botanists have pondered over its proper classification.

Where You’ll Find It Growing Wild

This southeastern native has made its home across a respectable swath of the American South. You can find it naturally occurring in Alabama, Florida, Georgia, Louisiana, Mississippi, South Carolina, Texas, and Virginia. It’s a true child of the southeastern states, adapted to the region’s particular climate and soil conditions.

The Honest Truth About Growing This Variety

Here’s where things get interesting – and a bit challenging. While Carolina wild petunia as a species is well-documented and cultivated, specific information about var. cinerascens is surprisingly scarce. This variety seems to be one of those plants that botanists know about but gardeners haven’t widely embraced, possibly because it’s less showy than other native options or simply hasn’t made it into mainstream horticulture.

What We Do Know

As a perennial forb, this plant will:

  • Return each year from its root system
  • Maintain a herbaceous (non-woody) growth habit
  • Fit into the broader Carolina wild petunia family characteristics
  • Be adapted to southeastern growing conditions

Should You Plant It?

The lack of specific cultivation information for var. cinerascens presents both a challenge and an opportunity. If you’re an adventurous gardener who loves supporting native biodiversity, this could be an intriguing addition to your collection. However, if you’re looking for a well-documented, easy-to-grow native with known garden performance, you might want to consider the more common Carolina wild petunia varieties or other well-established southeastern natives.

Alternative Native Options

If you’re drawn to the idea of Carolina wild petunia but want something with more cultivation information available, consider looking into other Ruellia species native to your area. Many southeastern natives offer similar ecological benefits with more gardening guidance available.

The Bottom Line

Ruellia caroliniensis ciliosa var. cinerascens represents the fascinating diversity within our native plant communities, even if it hasn’t made a big splash in garden centers. While we can’t provide specific growing instructions for this variety, its status as a southeastern native suggests it would appreciate the growing conditions that suit other plants from its region. If you do decide to seek out this particular variety, make sure you’re getting it from a reputable native plant source, and consider it an investment in botanical diversity rather than a guaranteed garden showstopper.

Carolina Wild Petunia

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Scrophulariales

Family

Acanthaceae Juss. - Acanthus family

Genus

Ruellia L. - wild petunia

Species

Ruellia caroliniensis (J.F. Gmel.) Steud. - Carolina wild petunia

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA