There is nothing special that makes a plant a houseplant. Most plants that are used as houseplants are tropical in origin and they look the same all year. They come from places that don’t have distinguishable seasons. Many plants that come from temperate regions have some distinction during the seasons.
Most orchids that are sold in nurseries are arboreal, meaning they are found in the wild growing in crotches of tree branches. In nurseries and houses they are kept in pottery for display and to keep them from falling over. Many types are planted in a commercial orchid may mix or bark to hold them. These mixes hold water at the right consistency for orchids.