Thanks, that's very helpful. I do like pine needle mulches on some of our outdoor beds but have never considered conifer detritus for orchid pots! (Bald cypress is planted widely here as an ornamental and occurs naturally farther south in the state, and we have a large dawn redwood, Metasequoia glyptostroboides, in our yard, so I have access to a very similar material. But I'm not surprised to hear it didn't work well.) I am using quite small clay pots instead of my normal plastic in hopes it will help keep the medium at the right moisture level while they're dormant.
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