Tall fescue has greater heat resistance than perennial ryegrass.

• A. Tall fescue has greater heat resistance than perennial ryegrass.
• B. Perennial ryegrass has greater heat resistance than tall fescue.
• C. Creeping bentgrass has the greatest heat resistance.
• D. None of these grasses have heat resistance.

Answer: (A)

In turf management, heat resistance describes how well a grass maintains color and growth during hot summer conditions. Tall fescue tends to be more heat-tolerant than perennial ryegrass because of its deeper, more extensive root system that can access moisture deeper in the soil, along with leaf traits that better withstand high temperatures. This combo helps tall fescue stay green and vigorous longer in heat compared to perennial ryegrass, which is quicker to establish but more prone to burn and decline when temperatures rise. Creeping bentgrass, while fine for some cool-season uses, isn’t known for high heat tolerance, so it wouldn’t be the option with the greatest heat resistance. Therefore, the statement that tall fescue has greater heat resistance than perennial ryegrass aligns with how these grasses perform under heat stress.