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A hot set tomato is a variety bred to set fruit reliably under high temperatures, where a standard tomato may fail. “Setting” means the blossoms are successfully pollinated and develop into fruit. Hot set varieties can continue to produce even during heat stress that would normally cause blossom drop.
Tomatoes are sensitive to heat; when daytime temperatures exceed 90°F, or nighttime temperatures stay above 70–75°F, pollination often fails. The pollen can become infertile, and flowers fall off before forming fruit because they have not been properly fertilized. “Hot-set” tomatoes have heat-tolerant pollen and flower structures, allowing them to set fruit in extremely hot conditions.
These varieties are ideal for regions with long, hot summers, such as the southern United States, or for late-season plantings when temperatures stay high. Commercial growers use them for continuous production through warm months.
Many modern “hot-set” cultivars have been bred to balance heat tolerance with good flavor and quality. However, in extreme heat, fruit size might be slightly smaller or ripen more slowly than in cooler conditions; the cultivar will yield more fruit than non-tolerant types in these extreme conditions, though.
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