What is a defining characteristic of annual weeds?

Annual weeds are characterized by their life cycle, which includes germination, growth, flowering, seed production, and death all within a span of one year. This rapid life cycle means that these plants complete their entire life process within a single growing season, typically producing a significant number of seeds that can germinate in subsequent seasons.

This characteristic is crucial for understanding how to manage and control annual weeds effectively, as their quick reproductive cycle allows them to rapidly establish and spread in various environments. The ability to grow, reproduce, and die within 12 months distinguishes them from other types of weeds, such as biennials, which take two years to complete their life cycle, and perennials, which live for multiple years and often have more complex growth patterns.