General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Partial Shade to Full Shade
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 12 - 24 inches
Plant Spread: 6 - 12 inches
Flowers: Showy
Flower Color: Lavender
Bloom Size: 1"-2"
Flower Time: Spring
Underground structures: Rhizome
Uses: Will Naturalize

Common names
  • Limestone Wild Petunia
  • Smooth Ruellia
  • Limestone Petunia
  • Limestone Ruellia
  • Wild Petunia

  • Posted by jmorth (central Illinois) on Nov 25, 2011 8:08 PM concerning plant:
    This species has only sparsely hairy stems and leaves and grows to 3' tall.
    Habitat is moister than its cousin R. humilis likes, lowland woods, borders of streams.

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