There are two main types of turfgrass - cool season and warm season. Cool season grasses like Kentucky bluegrass and tall fescue grow best in temperatures between 50-75 degrees F, while warm season grasses like bermudagrass and zoysia prefer warmer temperatures of 80-105 degrees F. The transition zone has characteristics of both where no single grass thrives year-round, requiring the use of mixtures or dormant grasses. Turfgrass serves both functional purposes like reducing erosion and ornamental purposes in landscaping. Quality is determined visually by traits like density, color, and texture as well as functional measures of rigidity, elasticity, and recuperative potential.