Some plants, like java fern, Anubias, and Bolbitus, have rhizomes (modified, horizontal stems) that can't be buried in the substrate or they'll rot.
Some plants, like java fern, Anubias, and Bolbitus, have rhizomes (modified, horizontal stems) that can't be buried in the substrate or they'll rot. You can plant the roots, but not the rhizome. For those plants, you can try tying them to decor or attaching them where you want with aquarium glue.