Coast of Maine Bar Harbor Blend Premium Potting Soil is now available in a new, lighter formulation. It is made with salmon, blueberry, lobster and other composts, calcium and chitin-rich lobster shells, sphagnum peat, perlite and kelp meal and designed for potting house plants, planting hanging baskets, window boxes and all containers. The compost gives it deep dark brown color as well as helping retain moisture.