Typically, perennial ryegrass is finer textured than Kentucky bluegrass, greens up about a month sooner in the spring, but doesn’t like temperatures above 85 degrees very much. Dwarf fescues are a heavier-bodied grass that is very deep rooting, thus giving it better drought tolerance than the other cool season grasses. It has better traffic durability than the other cool season grasses. In our Blue/Fescue mix we use special varieties of Kentucky bluegrass that assist with the mending but will not take over the fescue plants.