Grass seed buying dilemma? Was browsing the shelf- when purchasing grass seed - don't buy a package that does not indicate what types of grass seed it contains. For home lawns. buy only seed that contains these three: Kentucky bluegrass, perennial rye. Fescue. Some packages contain less than 10% seed by weight. The additives are there to increase spreadability, provide nutrients, enhance germination and profits. But we recommend buying name brand name quality seed. The extra cost is worth it.