Epiphyte.
A plant that grows on another plant for physical support without necessarily taking nutrients from that host.
What it means for your plants
Many epiphytes obtain moisture and nutrients from material around their roots and from their environment. The growth habit helps explain why some dislike dense, constantly wet media, but exact care still depends on the species.
IN PRACTICE
Some orchids naturally grow attached to trees and need a different potting environment from a terrestrial foliage plant.
Put it into practice
Compare potting mix, potting soil, garden soil, and compost so you can choose the right root environment for container plants.
Potting mix vs. garden soil: what belongs in a plant pot?