PROBLEM TO BE SOLVED: To provide a coated seed superior in water resistance, and a method of manufacturing the same.SOLUTION: Provided is a method of manufacturing a propagated body coating that includes the following: a step of mixing polyvinyl alcohol as a granular solid whose saponification degree is 78 mol.% or more with functional materials without being substantially melted, and forming, by using a liquid, a coating layer containing the polyvinyl alcohol, functional materials, and liquid on the surface of the propagated body coating; and a step of drying the coating layer.