Coast of Maine 1cf Penobscot Blend Organic Planting Mix – All-Purpose Soil Amendment is a rich, smooth, all-in-one planting mix designed to give trees, shrubs, and perennials a strong, healthy start. Produced by Coast of Maine, this premium organic planting mix is crafted from salmon and blueberry compost, finely crushed oyster shell fragments, and peat to create a nutrient-dense, biologically active soil enhancer. When blended with native soil, it improves aeration, adds texture, and encourages stronger root development, while supplying essential nutrients and beneficial microorganisms to support vigorous growth in new plantings and landscape installations.