Re: Passion Fruit
There are several reasons for vines flowering but not setting fruit.
* Poor pollination. This is the main cause and can be due to bees not working the flowers (for example during heavy rain); temperatures being too low or too high for pollination (optimum temperatures for pollen germination are between 20°C and 35°C); or rain directly reducing the viability of the pollen (moisture causes the pollen grains to split).
* Boron deficiency.
* Extended periods of overcast weather. This may cause flower drop regardless of pollination problems.
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