It's always a balance between water holding capacity and watering frequency. If you can water more often, that's usually the better choice. If your schedule doesn't allow for more frequent watering, you can increase the water holding capacity in several different ways. You can add a little bit of coconut husk chips or sphagnum moss to your mix. Another way to retain water is to stay with the same mix but to use a plastic pot instead of clay. Whichever culture practice you alter, do it gradually. Water a little more often or add a small amount of water retaining material. It takes time for orchids to adjust so it takes a while to know if the changes are achieving your goal. Good luck.
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