Abstract: A process for treatment of organic wastes from municipal wastewater to produce a product for spreading seed in an organic matrix includes the steps of providing organic waste including biosolids and their contained cellulose from municipal wastewater, rendering the organic waste free of foreign objects, rendering the organic waste pathogen free, and sterile relative to plant seeds, by milling in a batch or semi-batch format using a rotor-stator mixer or mill, and mixing the milled organic waste with waste paper products and/or pelletizing the mixture to form a horticultural mulch, to which seed can be added. The pH optionally is adjusted, and additional materials that aid in seed germination or plant growth optionally are mixed into the treated product. The final product is a high quality, beneficial re-use organic soil amendment that provides an enriched seed starter system for lawns or other commercial turf-grass operations.