I have heard the same, the shealth is prone for holding moisture causing rot to its inner anatomy. When I mist or water my plants I try diligently to avoid the sheaths and if the end results from being sloppy I merely grab for the bigger picker upper paper towel and soak up the moisture. Maybe another member has a different reference on the cause, hope this helps...
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Cheryl
“Respect does not come from the work you do, it comes from the way you do your work.”
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