Which of the following is not a cool-season turfgrass?

• A. Kentucky bluegrass
• B. Annual bluegrass
• C. Creeping bentgrass
• D. Centipedegrass

Answer: (D)

The key idea is differentiating cool-season versus warm-season turfgrasses by the temperatures they prefer. Cool-season grasses—like Kentucky bluegrass, annual bluegrass, and creeping bentgrass—perform best in cooler temperatures and mostly grow during spring and fall, often staying green in mild winters in temperate regions. Warm-season grasses, such as centipedegrass, thrive in hot, sunny summers and mild winters, common in warmer climates, and they tend to slow or go dormant when temperatures drop.

Centipedegrass fits the warm-season category, so it is not a cool-season turfgrass. In regions with hot summers, it thrives, while it struggles in consistently cool climates where the other three grasses do well.