Kentucky bluegrass is known to have greater low-temperature hardiness than annual bluegrass because it is a perennial species that thrives in colder climates and is adapted to withstand low temperatures.
The question of whether Kentucky bluegrass has greater low-temperature hardiness compared to annual bluegrass is looking at the adaptability of different grass species to cold climates. Based on the research and general knowledge about plant species' adaptations, it is true that many plants have developed mechanisms to withstand very low temperatures. While the evidence provided does not specifically mention Kentucky bluegrass or annual bluegrass, it is known that Kentucky bluegrass is a perennial species favored in colder climates due to its hardiness.
Moreover, plant species' reaction to cold temperatures varies widely. Some drought-resistant species may decline in cold environments, suggesting that there is an intricate balance regarding temperature preferences for different species. Kentucky bluegrass, being a cool-season grass, is likely to be better adapted to low temperatures than a species such as annual bluegrass, which is generally considered less cold-tolerant.