Old time growers in South Florida have told me that years ago tree fern fiber was the "go to" potting medium for Cattleyas and other orchids that like to dry quickly. They changed when tree ferns became scarce and the fiber became expensive. Tree fern fiber has a reputation for not breaking down very quickly. That's one reason that it's used for mounts. I would guess that Royal was correct in thinking that the author was probably talking about accumulated salts which can make almost any medium toxic over time.
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Threaded Mode
