First, the leaf blade elongates and is quickly followed by elongation of the sheath and then the internode. The shorter and later internode elongation allows the meristematic tissue to be retained low and near the soil surface while the leaves and sheaths grow well above this level. Thus, defoliation by mowing or grazing removes the leaves and not the meristem. The tiller may be defoliated, but it will continue to grow and produce foliage. Timing of defoliation does not appear to affect the emergence of other tillers, although the number of leaves may be reduced.
Some studies indicate that defoliation increases tiller numbers.
Kentucky bluegrass populations were found to be concentrated in the Visitor Center area and along the trail and mound areas. It was also found scattered in the old field areas. Kentucky bluegrass has the potential for long-term modification or retardation of succession, and poses an endangerment to the prairie vegetation. A limited number of control options exist for Kentucky bluegrass. Control methods for this species have been primarily chemical and cultural.