| Site | year | Location | Soil texture | SOM | pH | Seeding date | Emergence date | PP application date | POST application date | Giant ragweed | |
| Height (cm) | Density (plants m−2) | ||||||||||
| S1 | 2013 | Tilbury | Clay | 3.5 | 6.7 | May 25 | June 03 | May 08 | - | up to 7 | 322 |
| S1 | 2013 | Tilbury | Clay | 3.5 | 6.7 | May 25 | June 03 | - | May 27 | up to10 | 70 |
| S2 | 2013 | Essex | Clay | 3.4 | 7.7 | May 23 | June 01 | May 16 | - | up to 6 | 34 |
| S2 | 2013 | Essex | Clay | 3.4 | 7.7 | May 23 | June 01 | - | May 27 | up to 8 | 61 |
| S3 | 2014 | Harrow | Loam | 3.2 | 7.4 | May 24 | May 30 | May 16 | - | up to 16 | 28 |
| S3 | 2014 | Harrow | Loam | 3.2 | 7.4 | May 24 | May 30 | - | June 12 | up to15 | 22 |
| S4 | 2014 | Harrow | Clay | 3.2 | 7.6 | June 02 | June 11 | May 30 | - | up to 12 | 16 |
| S4 | 2014 | Harrow | Clay | 3.2 | 7.6 | June 02 | June 11 | - | June 16 | up to 31 | 7.5 |