Kellogg Garden Organics 622 0.3-0.1-0.1 Gromulch 2-in-1 Planting Mix and Mulch 2.5 CuFt is a 2-in-1 planting mix and mulch recommended for trees, shrubs, and flowers. You can use Gromulch as a soil amendment to add a boost of nutrients to your trees, shrubs, roses and groundcover. It helps loosen compacted clay soil, adding rich organic material that provides the perfect balance of moisture retention and aeration for strong root growth and bigger, more-lush plants.