Cascade Seed - Erosion Control interest area Erosion Control Erosion is prevented by fast root growth in freshly cultivated soil.
Annual ryegrass grows fast, but perennial ryegrass grows more roots faster.
Grass is an important component of most soil stabilization solutions. I don't know either. 100's of millions of dollars. They don't let cooperators harvest the top growth of the grass plants on millions of acres because they want this to drop and contribute to the creation of future soil and decay to support root growth. Obviously, there is an urgency and immediacy to most erosion control circumstances.