Had you looked at it recently, and they weren't like that prior to the temp drop? It really doesn't look bad to me... more like a little cold damage. They're a thin-leaved plant. At 40F and windy, probably cold just nipped it a bit. They also like it really humid, and with the wind being high that could also have caused it.
Just keep watching it and don't mess with it too much. A friend of mine who grows a lot of them top dresses with a little dolomite lime in spring and fall.
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Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.
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