What term describes a weed that completes its life cycle in one year and is usually perpetuated by seed?

• A. Annual Weed
• B. Biennial Weed
• C. Perennial Weed
• D. Noxious Weed

Answer: (A)

An annual weed is defined by completing its entire life cycle in a single growing season and typically persisting through seed production. In turf, these weeds germinate, grow, flower, set seed, and die within one year, so their populations rely on seeds to continue each year. That’s why this term best fits a weed that is usually perpetuated by seed — the main means it uses to survive from one season to the next.

The other terms describe different patterns: a biennial takes two growing seasons to complete its life cycle, and a perennial lives for multiple years, often spreading vegetatively as well as by seed. A noxious weed is a regulatory designation, not a statement about its life cycle. Knowing this helps you predict likely persistence and choose control approaches focused on preventing seed production and limiting new seed germination for annuals. For example, targeting seed set and timing treatments before or as seeds form is a common strategy for annual weeds in turf.