This ability enables bluegrass to rapidly recuperate from in- jury and fill in thin areas in the lawn. Kentucky bluegrass is winter-hardy and capable of withstanding temperature and moisture extremes. During hot, dry peri- ods it tends to become dormant and lose color. If high quality is desired during the summer period, lawn irrigation is often necessary.
Zoysia is grown in southern New Jersey for summer lawns on sandy soil.
It will not tolerate extremely acid or alkaline soils or heavy shade. Germination and establishment rates are slow, and weeds may develop if seeded in late spring or early summer. Kentucky bluegrass requires a medium to high level of management with routine applications of fertilizer. Although Ken- tucky bluegrass performs best in full sun, some cultivars are adapted to shade. For light to moderate shade, seed a mixture of Kentucky bluegrasses and fine fescues.