Blood and bone is a product that comes as a by-product of the meat industry and it is a common fertilizer that can be used for flowers, vegetables, trees, and lawns. Blood and bone contains nitrogen and is high in phosphorus. It is a product that is good for tomatoes and offers the advantage that it has good levels of calcium and can help to prevent blossom end rot of tomatoes. See an example of Hi-Yield Bone & Blood Meal available at Nature Hills.