| Date | Location | Notes | Images |
|---|---|---|---|
| August 10, 2010 | Southeastern, New Hampshire |
|
| Date | Location | Notes | Images |
|---|---|---|---|
| April 17, 2011 | Southeastern, New Hampshire | Picture of a dead Canadian Horseweed plant after the Winter. |
|
| Date | Location | Notes | Images |
|---|---|---|---|
| July 29, 2023 | Los Lunas, New Mexico |
|