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Black Eyed Susan

Black Eyed Susan

Rudbeckia hirta

  • Common Name: Black Eyed Susan
  • Scientific Name: Rudbeckia hirta
  • Family Name: Compositae
  • Origin: North America
  • Height: 2’ – 3’
  • Width: 2’ – 3’
  • Growth: Moderate growth.        
  • Zone: 2 - 11
  • Light Needs: Full sun
  • Salt Tolerance:  High – great for planting close to beaches.
  • Soil/PH/Texture: Clay, sand, loam – likes acidic soil but will tolerate most well-drained soils if given full sun. Acidic – neutral (pH 5.6 – 7.5).
  • Soil Moisture: Average water needs but do not overwater.
  • Drought Tolerance: High
  • Pests/Diseases: Long-term health usually not affected by pests, but they can occasionally get aphids, goldenglow sawfly, four-lined plant bug, and downey mildew or Verticillium wilt may kill Rudbeckia spp.
  • Growing Conditions: May be a noxious weed or invasive from volunteer seedlings.
  • Characteristics: This deciduous plant has green leaves that are simple, arranged alternately, ovate in shape and about 4” -8” in length. It forms a clumping, 2-foot-tall mound of foliage topped with a bright display of red/orange flowers bordered with yellow, and blooms summer and fall. You will want to remove old flowers to promote more blooms.
  • Propagation: By seed, division or cuttings and it may self-seed each year.
  • Wildlife: Attracts birds, bees and butterflies.
  • Facts: All parts of this plant are poisonous if ingested.
  • Designer Considerations: Used in mass plantings, border, or as cut flowers.
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