Answer: Blossom drop can be caused by a number of reasons, ranging from lack of pollination to weather extremes -- nights too hot or too cold, too much rain, not enough rain, and so on. The best you can do is make sure that the soil is kept evenly moist. Be sure you are not doing anything to discourage bee and wasp activity and thus inadvertently limiting pollination. Some gardeners also report some success from shaking the plants to stimulate pollen movement and using a "blossom set" spray available in garden centers, but even this will not help under extreme conditions.
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