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Silphium perfoliatum (Cup Plant)
| Date | Action |
| Jun 09 2009 | Canadian Chelsea (41) added "5 to 10 feet (1 1/2 to 3 m)" to Height (Maximum) |
| Jun 09 2009 | Canadian Chelsea (41) added "Tolerant of Most Types" to Soil Types |
| Jun 09 2009 | Canadian Chelsea (41) added "Full Sun" to Sun Exposure |
| Jun 09 2009 | Canadian Chelsea (41) added "Indian Cup Plant" to Common Names |
