Blossom drop is a common tomato growing problem that can be extremely frustrating to the home gardener. There can be many causes of blossom drop, but the most common is excessively high or low temperatures. Many of the problems that cause blossom drop can be difficult to control because they are related to temperature and plant stress, like lack of pollination, lack of water or stress from insect damage/disease. Because factors like temperature and humidity are out of the gardener's control, sometimes you just have to be patient and wait for conditions to correct themselves.

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Source: The Spruce