Which of these grasses is not a warm-season grass?

Smooth brome is classified as a cool-season grass, which distinguishes it from the other options listed. Cool-season grasses tend to grow and thrive in the cooler temperatures of spring and fall, while warm-season grasses flourish in the warmer months of late spring and summer. Smooth brome, specifically, has its peak growth during the cooler parts of the year, making it well-suited for use in areas with a more temperate climate.

In contrast, switchgrass, big bluestem, and Bermudagrass are all characterized as warm-season grasses, meaning they have adapted to thrive in higher temperatures and are most active during the warmer months. This group of grasses plays a crucial role in various ecosystems, especially in prairies and grasslands, where their growth patterns contribute to soil health and provide habitat for wildlife during the warm season. Understanding these distinctions is essential for effective land management and agricultural practices.