Silphium radula, Roghstem Rosinweed

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Special Note:

Members of the Silphium genus are known to hybridize making identification difficult at times. Similarly to other species in the genus, S. radula disc florets (inner florets) are sterile while the ray florets (outer florets) produce seeds. Silphium species are highly attractive to bees and butterflies.

  • Listing ID: 1207
  • Soil Moisture: 1-5 (dry to wet): 2-3
  • Stratification: 60 days cold moist stratification required
  • Bloom Time: June-August
  • Duration: Perennial
  • Sunlight Exposure: Partial shade to full sun
  • Family: Asteraceae (Aster)
  • Latin Name: Silphium radula
  • Common Name: Roughstem Rosinweed
  • Eco-Region: 251