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How to Prevent and Control Calyx Splitting in Carnations

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In the cut-flower cultivation of carnations (also known as Dianthus caryophyllus or musk pink), a physiological disorder often occurs: calyx splitting. The physiological cause of calyx splitting is that the petals grow and quickly outpace the calyx, bursting it open, especially in large-flowered varieties with 60 or more petals. In addition, during the flowering stage, if continuous low temperatures occur, because the number of petals or flowers increases and the day-night temperature difference is large, calyx splitting occurs more often. Therefore, low temperatures, excessive watering or excessive fertilizer, especially excessive phosphorus, very easily cause calyx splitting. Methods to prevent calyx splitting:

In the cut-flower cultivation of carnations (also known as Dianthus caryophyllus or musk pink), a physiological disorder often occurs: calyx splitting. The physiological cause of calyx splitting is that the petals grow and quickly outpace the calyx, bursting it open, especially in large-flowered varieties with 60 or more petals. In addition, during the flowering stage, if continuous low temperatures occur, because the number of petals or flowers increases and the day-night temperature difference is large, calyx splitting occurs more often. Therefore, low temperatures, excessive watering or excessive fertilizer, especially excessive phosphorus, very easily cause calyx splitting.

Methods to prevent calyx splitting:

1. Raise the nighttime temperature of the growing room, ventilate fully during the day, reduce the day-night temperature difference, water appropriately, and avoid a sudden change from too dry to too wet;

2. Within 1-2 weeks of flowering, wrap the calyx part with a plastic band into a cup shape, or fit on a wire ring;

3. Treat flower buds the size of soybeans with 30-50 PPM gibberellin.

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