The Castine Blend Raised Bed Mix is the ideal soil for raised bed organic gardening. This is an enriched blend of fully cured compost, sphagnum peat moss, dehydrated poultry manure, lobster and crab shell meal, greensand, biochar, worm castings and mycorrhizae. The Castine Blend is carefully formulated to provide balance between structure, water retention, drainage and aeration for growing strong, vigorous vegetables, herbs and flowers in raised beds, planter boxes or other container gardens. It provides your garden the rich and diverse soil it needs. OMRI listed.