| Impact ID | 7039 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Hydrilla verticillata grows aggressively and competitively, spreading through shallower areas and forming thick mats in surface waters that block sunlight penetration to native plants below. |
| Reference | 10285 |
| Great Lakes Region | No |
| Cost | |
| Location | |
