Why is lawn seed sold as a blend?
A lawn seed blend is made up of several varieties of the same species. Seed varieties are developed by breeders to meet certain characteristics desired by the customer. In a perfect world, the breeder would be able to combine all the good characteristics in the same variety. But Mother Nature isn’t molded that easily. If a variety excels in wear tolerance for instance, it might not be as winter hardy. Or the fine blade cannot be combined with the shade tolerance, etc. To give the customer a lawn seed that can adapt to the various conditions of the home lawn, varieties with different characteristics are combined: You need wear tolerance because your kids will play on the lawn, or you are planning that neighborhood barbeque; you need shade tolerance because your back yard has a lot of trees; you want your lawn to be resistant to disease, but not just to one, to any disease that might attack your lawn; you want your lawn to be tolerant to the summer heat but also to the cold winter days.
Blending varieties together that have top performance on some of the desired characteristics, allows the lawn to adapt itself to the conditions. In the shady areas, the varieties with good shade tolerance will prevail, in the high traffic areas the best wear tolerant varieties will prevail, etc. The result is a beautiful lawn everywhere, from the same seed blend.