Which is not an annual weed?

Which is not an annual weed?

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

Answer: (A)

The key idea is weed lifecycles: some weeds complete their entire life cycle in one growing season (annuals), while others persist year after year (perennials) and can spread via underground structures like rhizomes or crowns. Johnsongrass is a perennial weed in turf. It survives from year to year by sending out rhizomes and regrowing, so it doesn’t die after a single season. That persistence makes it not an annual. The other options are annuals (or behave as winter annuals): crabgrass and foxtail complete their life cycles within one season, and annual bluegrass typically behaves as a winter annual, germinating in fall, growing through winter, and dying in late spring.

The key idea is weed lifecycles: some weeds complete their entire life cycle in one growing season (annuals), while others persist year after year (perennials) and can spread via underground structures like rhizomes or crowns.

Johnsongrass is a perennial weed in turf. It survives from year to year by sending out rhizomes and regrowing, so it doesn’t die after a single season. That persistence makes it not an annual. The other options are annuals (or behave as winter annuals): crabgrass and foxtail complete their life cycles within one season, and annual bluegrass typically behaves as a winter annual, germinating in fall, growing through winter, and dying in late spring.