Answer: The plants you have listed are annuals so they will die down with the first frost. If you'd like them to come back next spring, allow the flowers to develop seeds and either allow the seeds to spill onto the soil, or collect and save them for sowing in the bed next year. After frost kills the plants down, pull them up, shake the seeds over the bed, and then cover the bed with a few inches of organic mulch material. Next spring some new plants will sprout in the bed. Enjoy your garden!
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