What is the difference between summer and winter annuals?

What is the difference between summer and winter annuals?

• A. Summer: germinate spring, die before winter; Winter: germinate fall, die before summer.
• B. Summer: germinate winter, survive summer; Winter: germinate summer, survive winter.
• C. Summer: spread by rhizomes; Winter: spread by bulbs.
• D. Summer: only in fields; Winter: only in greenhouses.

Answer: (A)

Annuals complete their life cycle in one year. The difference between summer and winter annuals is when they start growing and when they die within that year. Summer annuals germinate in spring, grow through the warmer months, and finish their life cycle by late summer or early fall, dying before winter arrives. Winter annuals germinate in fall, survive through winter, and then complete their life cycle in spring, dying by late spring or early summer. This timing is why you’ll see different weeds at different times of the year: crabgrass is a classic summer annual, while annual bluegrass (Poa annua) is a typical winter annual. The distinction is about seasonal timing of germination and death, not about where the plant grows or how it spreads (rhizomes versus bulbs) or other environmental constraints.

Annuals complete their life cycle in one year. The difference between summer and winter annuals is when they start growing and when they die within that year. Summer annuals germinate in spring, grow through the warmer months, and finish their life cycle by late summer or early fall, dying before winter arrives. Winter annuals germinate in fall, survive through winter, and then complete their life cycle in spring, dying by late spring or early summer. This timing is why you’ll see different weeds at different times of the year: crabgrass is a classic summer annual, while annual bluegrass (Poa annua) is a typical winter annual. The distinction is about seasonal timing of germination and death, not about where the plant grows or how it spreads (rhizomes versus bulbs) or other environmental constraints.