If you don't want medium, you may as well grow them mounted. It is fun to grow mounted orchids. Some orchids do better in a basket with some medium because it retains moisture a little longer and allows the plant to absorb more of the water. When I water on a dry windy day, the water can evaporate so quickly that the plant doesn't get much of it. The medium will hold it longer. I water my mounted orchids every day and sometimes twice a day. My orchids in baskets do well with watering two or three times a week.
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