Answer: Tomato blossom drop can occur for a number of reasons, mostly related to weather. Hot or cold nights, hot or cold days, excessive wind or badly timed rain can all cause blossoms to drop. Lack of pollination either due to lack of insect activity or poor weather conditions can also cause it. Finally, uneven moisture conditions can cause the blossoms to fall off. Since you can't control the weather, make sure the soil is kept evenly moist. If you suspect a pollination problem, shake the plant once a day or so. Lastly, you could also try a blossom set spray available through most garden centers.
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