When planting a new lawn from seed. Should you seed with a mixture of just KBG seeds like "Best of the Blues" mix which has Midnight, Challanger, Denim and Opti-green, all KBG cultivars. Or do you recommend a blend of multiple cultivars of different species. I see so often a blend such as one they call Bluemix that is 50% Baron or KenBlue Kentucky Bluegrass, 40% Morning Star or Shining Star Perennial Ryegrass, and 10% Flyer I - Creeping Red Fescue. The lawn I am re doing is south facing on a slight hill about 1200 sq feet. I have killed the old lawn with roundup and roto-tilled Canadian Sphagnum peat moss into the soil. We live in Denver Colorado. So what is better a pure KBG mix or a blend of KBG, rye and fescue? Why would you do one over the other?