The following invention represents a postcard, comprising a laminar body adapted to be decorated externally with at least one predefined illustration. Said body has an opening for access to an internal recess, said opening is normally closed by a removable cover. The recess accommodates at least one seed and a substrate, and that at least one seed is arranged on the top of the substrate and directed toward said opening, for the sprouting of a plant after the removal of the cover and the addition of water into the recess. The seed is normally being retained on the top of said substrate by a laminar containment element, which is made of water-soluble material and is interposed between the substrate and the cover.