Establishing aquatic plants in reservoirs isn't easy, according to Texas Parks and Wildlife fisheries biologist Mark Webb, lead author of a manual on how to establish macrophytes.
"First, you have to overcome the reasons native macrophytes don't grow in reservoirs to start with: water-level fluctuations, hard clay or rocky bottoms, often turbid conditions, lack of a source of native plants, and sometimes the presence of exotic plants," he says. "Then you have to deal with herbivores. Even turtles eat aquatic plants. Herbivores are not a problem when vegetation is well established, but when your carefully planted stock is the only veggie available, herbivores can wipe you out."