| Species | Year | Nearest Town | Planting Date | Emergence Date | Herbicide Application Date |
| GR horseweed | 2018 | Ridgetown | May 9 | May 20 | May 11 |
|
| 2018 | Thamesville | May 9 | May 20 | May 11 |
|
| 2018 | Harrow | May 25 | May 31 | May 25 |
|
| 2019 | Zone Centre | May 22 | May 29 | May 24 |
|
| 2019 | Ridgetown | May 24 | May 30 | May 24 |