Answer: Tomato pollen isn't viable much over 90 degrees, so the plants stop setting fruit when it gets that hot. As a general rule, cherry tomatoes and the small to mid-size tomatoes will perform better in the heat, as they don't take as long to mature. The big beefsteaks don't do well. Plants that I've grown that produce good fruit in desert heat include yellow pear, celebrity, early girl, and most of the cherry tomatoes. Heatwave II is bred to survive up to 100 degrees, but I haven't tried it yet.
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