Which grass is not considered a jointing type?

The correct choice highlights that bluegrass is not considered a jointing type of grass. Jointing grasses, such as bromegrass, timothy, and orchard grass, exhibit a particular growth habit characterized by the formation of distinct nodes or joints at the base of the stems. These joints are crucial for the grass's growth, especially during the flowering and seed-setting stages, allowing for the versatile management of pasture and hay systems.

Bluegrass, on the other hand, is a type of grass that typically grows as a bunchgrass. Its growth habit does not involve the development of visible joints, which differentiates it from jointing types. This lack of joint formation in bluegrass affects its maturity characteristics and management practices compared to jointing grasses, which often respond differently to grazing and cutting.

Understanding these distinctions is important for effective crop management, as it influences decisions regarding seeding rates, maintenance, and expected yield outcomes from different grass types.