Final answer:
Annual bluegrass in the southern U.S. is a winter annual that completes its life cycle in one year, growing and reproducing rapidly within a single growing season.
Step-by-step explanation:
In the southern U.S., annual bluegrass is typically a winter annual that completes its life cycle within a single year.
While some plants, like the mentioned wheat, can be considered winter annuals as they germinate in the fall, overwinter, and then flower in the spring, annual bluegrass usually follows this pattern in temperate regions with pronounced seasonal variations such as the temperate grasslands of North America.
Unlike biennials, which require two seasons to complete their life cycle, or perennials, which live for multiple years, annuals like the annual bluegrass complete their growth and reproductive cycle within one season. As a result, they often flower earlier each year as they age, aligning with their life strategy of rapid growth and reproduction within a single growing season.