Lobelia siphilitica

Cardinal Flower-Blue, Great Blue Lobelia

Photo Credit: Susan Martin


Lobelia siphilitica

Cardinal Flower-Blue, Great Blue Lobelia

Thriving in similar conditions as L. cardinalis, this native species produces dense terminal racemes of light to dark blue, two-lipped flowers which attract pollinators. Stiffly upright stalks rise above the finely toothed, light green leaves. Though somewhat short-lived, it persists by reseeding.

Plant Details

  • Zone: 4 - 8
  • Height: 2-3'
  • Spread: 1-2'
  • Exposure: Full Shade, Part Shade
  • Soil Moisture: High Water Needs, Moderate Water Needs
  • Drought tolerant: No
  • Bloom time: Early Fall, Late Summer, Midsummer
  • Foliage Color: Green Shades
  • Flower Color: Blue Shades
  • Fragrant: No
  • Good Cut Flower: Yes
  • Native: Native Species
  • Deer resistant: Yes
  • Rabbit resistant: Yes
  • Bee-friendly: Yes
  • Attracts butterflies: Yes
  • Attracts hummingbirds: Yes
  • Groundcover: No
  • Roy Diblik Favorite: No

Plant Details

  • Zone: 4 - 8
  • Height: 2-3'
  • Spread: 1-2'
  • Exposure: Full Shade, Part Shade
  • Soil Moisture: High Water Needs, Moderate Water Needs
  • Drought tolerant: No
  • Bloom time: Early Fall, Late Summer, Midsummer
  • Foliage Color: Green Shades
  • Flower Color: Blue Shades
  • Fragrant: No
  • Good Cut Flower: Yes
  • Native: Native Species
  • Bee-friendly: Yes
  • Deer resistant: Yes
  • Rabbit resistant: Yes
  • Attracts butterflies: Yes
  • Attracts hummingbirds: Yes
  • Groundcover: No
  • Roy Diblik Favorite: No

Grower Information

  • PowerPlug Size(s): 32s
  • Optimal Planting Time: Spring
  • Retail Sales Window: Spring, Summer
  • Moisture in Production: Consistent
  • Requires Shade in Production: Yes
  • Vernalization Required for Bloom: No
  • Vernalization Beneficial: Yes