Bumper Crop® Organic Soil Builder can greatly improve the quality of your garden soil! It will loosen clay up clay and hard, compacted earth to improve drainage, planting texture, and aeration. It will help bind sandy or rocky soils to promote water retention. It features a blend of manure and a high organic nutrient content of shellfish compost, dark, rich earthworm castings (to add minerals and biology), kelp, peat, aged bark, and lobster. It's inoculated with endo and ectomycorrhizal fungi to improve root function. The lobster body provides a lot of nitrogen, and the shells breakdown to release a lot of calcium, which are the top ingredients that plants need. bIn all kinds of garden soils, Bumper Crop® Soil Builder will make cultivation easier, provide better moisture absorption and retention, increase all-around soil aeration and provide a beneficial environment for micro-organisms. This product excels as a nutrient-rich top dressing and mulch. OMRI Listed.