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Silphium perfoliatum (Cup Plant)
| Date | Action |
| Jun 09 2009 | Canadian Chelsea (41) added "Ovate" to Leaf Shape |
| Jun 09 2009 | Canadian Chelsea (41) added "August" to Flowering Start |
| Jun 09 2009 | Canadian Chelsea (41) added "Autumn / Fall" to Flowering End |
| Jun 09 2009 | Canadian Chelsea (41) added "Division" to Propagation Techniques |
| Jun 09 2009 | Canadian Chelsea (41) added "Seed" to Propagation Techniques |
| Jun 09 2009 | Canadian Chelsea (41) added "Some Experience" to Skill Level |
| Jun 09 2009 | Canadian Chelsea (41) added "Wildlife Garden" to Suitable For |
| Jun 09 2009 | Canadian Chelsea (41) added "Low Maintenance Garden" to Suitable For |
| Jun 09 2009 | Canadian Chelsea (41) added "Butterfly Garden" to Suitable For |
| Jun 09 2009 | Canadian Chelsea (41) added "Perennial" to Plant Types |
