Blood meal is dried, powdered blood used as a high-nitrogen fertilizer. It is one of the highest non-synthetic sources of nitrogen. If over-applied it can burn plants with excessive ammonia, so please follow directions in application. Blood meal is completely soluble and can be mixed with water to be used as a liquid fertilizer. It usually comes from cattle as a slaughterhouse by-product. It may also be spread on gardens to deter animals such as rabbits, or as a compost activator. Blood meal provides a slow release form of natural nitrogen. Aids in plant production of top growth and deep green foliage. For use on pansies, roses, flowers, shrubs and vegetables. Hi-Yield Blood Meal Analysis: 12-0-0. This Blood meal comes in a package weighing 2.75 lbs.