ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,419,211, issued on Sept. 23.

"Plant propagation medium and methods of making and using it" was invented by Joel Douglas (Bonita Springs, Fla.), Shem Lachhman (West Harrison, N.Y.) and Michael Curtis (Columbia, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a hydroseeding substrate comprising primary solids from an anaerobic digester, a cover composition comprising bentonite clay and a water-dispersible polymer or starch, and a surface-treated hydroxypropyl methyl cellulose (HPMC). The primary solids may comprise fibrous solids from dairy, poultry, hog, or cattle waste. The water-dispersible polymer may include one ...