Celosia (cockscomb) is a true annual, but it self-seeds prolifically. In Baltimore's climate, seeds dropped in fall germinate the following spring, creating the illusion of a perennial return.
This is common with many annuals (tomatoes, four-o'clocks, impatiens). To control spread, deadhead before seeds mature, or thin volunteers in spring.
Enjoy the free plants, or treat them as a self-sowing annual bed.
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