What type of weed is typically classified as a summer annual grassy weed?

Crabgrass is typically classified as a summer annual grassy weed due to its life cycle and growth patterns. It germinates in the spring, thrives during the warm summer months, and completes its life cycle by producing seeds before the cooler fall temperatures arrive. This weed prefers sunny areas and can rapidly establish itself in lawns and gardens, often outcompeting desirable turf grasses for resources.

In contrast, other options listed have different classifications. Chickweed is a winter annual, meaning it germinates in fall or early spring and grows during the cooler temperatures of the year before dying off in summer. Henbit is also considered a winter annual with similar growing patterns. Quackgrass is a perennial grassy weed that can persist year-round and reproduce through underground rhizomes, setting it apart from summer annuals. Therefore, crabgrass stands out as the quintessential summer annual grassy weed.