What causes the tip or ends of the leaves to become blackened?

blackened causes ends leaves tip
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What causes the tip or ends of the leaves to become blackened?

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Blackened leaf tips may be caused by hard water, overfeeding with orchid nutrients or fungal disease. Remember that the potting mix needs to be flushed out thoroughly with plain water in between feeding. Cut off any black tips on leaves to prevent the die -back from continuing to run back down the leaf. Use a sterilized pair of scissors.

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