It is capable of withstanding very low cutting heights. Creeping bentgrass is a very fine-textured grass with flat, narrow leaves, a bright green color, and a shallow root system. It requires a high level of nitrogen fertilization and needs to be irrigated fairly frequently because of its shallow roots. Kentucky bluegrass requires frequent irrigation during the summer months because of its shallow root system. The species of ryegrass used for turfgrass are annual and perennial ryegrass.
Annual ryegrass has low heat tolerance, is coarse textured, and shiny dark green.
It dies in late spring to early summer. Perennial ryegrass is well adapted to sunny or partially shady conditions. It grows best during periods of cool temperatures and is very competitive, rapidly establishing a uniform green cover. Fall seeding is preferred. Perennial ryegrass has a bunchgrass-type growth habit, thus open areas should be reseeded.