Some situations call for a fast growing aggressive plants that will form a root-bound mass and hold the soil in place to stop erosion. While these plants may not be appropriate in your garden with other plants, we can suggest plants perfect for this situation. Sometimes this calls for using an invasive plant where you need extreme toughness and it can’t spread out of its pre-determined boundary! This can be much more economical than building a retaining wall or covering the site with rock.