Uses: Planting amendment for annuals, perennials, shrubs and trees; conditioning garden beds and borders. Also terrific for growing vegetables! We believe Penobscot Blend™ Organic & Natural Planting Mix is the ideal soil amendment for bedding annuals and planting perennials, roses, shrubs and trees. It provides the rich and diverse soil your plants need. Formulated from compost, aged bark, oyster shell and mycorrhizae.