61662
The various hydroponic media available , such as expanded clay and coconut husk , contain more air space than more traditional potting mixes , delivering increased oxygen to the roots , which is important in epiphytic plants such as orchids and bromeliads , whose roots are exposed to the air in nature .
 epiphytic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 epiphytic