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Still Learning
Join Date: Aug-2004
Location: Florida
Country: USA
Posts: 744
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Air circulation may be a part of the problem. Could it be there is more humidity than air flow on your windowsill and the other plants? Moisture/humidity and lack of air flow promotes mildew which could be what you are seeing on your windowsill? It's hard to say if the fan will help but it certainly won't hurt.Regarding the elm I would tend to agree with Matt and Mr. Bond, old leaves.
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