Most common weeds found in the treatments.
| 1991 | 1992 | |
|---|---|---|
| 1. | Senecio vulgaris | Senecio vulgaris |
| 2. | Taraxicum officinale | Taraxicum officianale |
| 3. | Panicum dichotomiflorum | Lonicera spp. |
| 4. | Digitaria sanguinalis | Solidago spp.* |
| 5. | Cyperus esculentus* | Vitus spp. |
| 6. | Setaria glauca* | Oxalis stricta* |
| 7. | Cirsium lanceoltum | Quercus spp. |
| 8. | Solidago spp.* | Cyperus esculentus* |
| 9. | Ambrosia artemesiafolia | Plantago rugelii |
| 10. | Medicago lupulina | Agropyron repens |
| 11. | Oxalis stricta* | Setaria glauca* |
| 12. | Trifolia reptans | Erigeron canadensis |
↵* Weed species that maintained their top twelve status but changed position in the hierarchy.
Total number of weed species in study 1991. 21 weed species 1992. 43 weed species