Under most conditions a properly balanced mixture of the fine-bladed grasses is best. Some grasses thrive on thinner soil, some in partial shade, others start quicker, and some stay green longer. That is why Earl May brand Maypark is the best.
Good food makes grass grow, too.
It also contains iron and sulfur, which becomes deficient in midwestern lawns. They will respond with vigor and a deep green color. All lawns should be fed at lease twice a year - early spring and again in the fall. Adequate moisture may spell the difference between success and failure. Midday drying, particularly in late spring and summer, can result in heavy loss of young grass plants.