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trinigirl - you may want to look a using different potting media. A lot of the bark mixes don't hold up well. I've switched to a mix of charcoal and aliflor with large bark pieces because the smaller mostly bark mixes broke down in less than a year.
A local orchid grower Jeff Higel of Orchids Etcetera makes a mix that doesn't break down at all, I just started several of my plants in it. It does so well for him that he just up pots the orchids he's growing in it. I liked working with it so much I've decided to move all my Oncidiums to it.
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