Lots of annuals thrive in hot summer weather, tolerating even periods of prolonged drought in style. Many annuals have this preference because their predecessors, or ancestors if you will, originated in warm, tropical climates with long growing seasons. All plant breeders did was capitalize on or preserve these qualities while improving the plants' appearance or expanding the color range.
Some warm-weather annuals are actually perennial in some regions but are used as annuals in other areas because they're not hardy there (they don't survive the winter). For instance, snapdragon can be a perennial in the South but is used as an annual farther North. Some tropical plants are also commonly used for temporary display.
Examples of favorite warm-weather annuals include impatiens, Madagascar periwinkle, and marigolds.
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