How do some orchids grow near high-tide level on mangrove roots?

Some orchid species, such as certain members of the genus Brassavola found in parts of Central America, are capable of growing on mangrove roots at or slightly above the high-tide level.1

These plants are epiphytes, meaning they use the mangrove roots merely for physical support rather than as a source of nutrition. As epiphytes, they do not rely on the ground for nutrients; instead, they obtain water from rain and atmospheric moisture, and they absorb minerals from organic debris that collects on their host. This specialized ecological tolerance allows them to thrive in unique habitats where they are positioned to access light and moisture while remaining attached to their supporting structure.21