Which of the following is a winter annual weed?

Which of the following is a winter annual weed?

• A. Annual bluegrass
• B. Crabgrass
• C. Goosegrass
• D. Foxtail

Answer: (A)

Winter annual weeds germinate in fall, survive through winter, and complete their life cycle in spring. Annual bluegrass fits this pattern perfectly: it sprouts when cool fall temperatures arrive, persists through winter (often forming a light green rosette and even seed heads in winter), and then dies off as temperatures rise in late spring. That fall-to-spring life cycle is what defines it as a winter annual. In contrast, the other grasses listed—crabgrass, goosegrass, and foxtail—are warm-season annuals. They tend to germinate when soil warms in late spring or early summer and die out by frost, rather than surviving the winter. That's why they aren’t winter annuals.

Winter annual weeds germinate in fall, survive through winter, and complete their life cycle in spring. Annual bluegrass fits this pattern perfectly: it sprouts when cool fall temperatures arrive, persists through winter (often forming a light green rosette and even seed heads in winter), and then dies off as temperatures rise in late spring. That fall-to-spring life cycle is what defines it as a winter annual.

In contrast, the other grasses listed—crabgrass, goosegrass, and foxtail—are warm-season annuals. They tend to germinate when soil warms in late spring or early summer and die out by frost, rather than surviving the winter. That's why they aren’t winter annuals.