| Impact ID | 7914 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Marsh thistle (Cirsium palustre) is able to produce 2,000 viable seeds per plant. Only a few plants are needed to have a drastic impact on the seed bank of an area. |
| Reference | 25235 |
| Cost | |
| Location | |