Generally in cultivation we try to replicate the various environmental requirements orchids would receive in the wild. They grow on trees, rocks or terrestrially in the ground, or thick leaf litter. But I must say, I've never seen an orchid in the wild growing in a pot! However, for convenience and practicality most orchids are grown in pots. All terrestrial and most epiphytic orchids are grown in pots, which accommodate the plants root system whilst also being able to retain moisture. They are easily transported, displayed, acquired and are relatively inexpensive. Another bonus is that they are reusable after cleaning in a mild bleach solution.
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