Related Terms. 1  operating system virtualization. 2  mobile operating system (OS). 3  OS-operating system. 4  server operating system. 5  system. 6  Microsoft Windows XP operating system. 7  Linux OS (Operating System). 8  paravirtualized operating system. 9  NOS-network operating system. 10  Chrome OS.
Prune and shape evergreen shrubs to provide year-round hedges, ground covers and privacy screens in your yard. The scarlet firethorn (Pyracantha coccinea) and Chinese holly (Ilex cornuta) shrubs produce red-colored berries and dark-green leaves.
Abies. Forming perfect pyramids, firs bring a bit of mountain magnificence to urban and suburban gardens. This family of long-lived evergreen trees is valued for soft needles, graceful branches, and strong fragrance.It's no wonder that fir cultivars are frequently chosen by the American Conifer Society as Conifer of the Year. Balsam, Fraser, and noble firs are popular Christmas trees.ompact blue alpine fir. Abies lasiocarpa var arizonica 'Glauca Compacta' offers silvery blue needles on a small tree that reaches 15 feet tall and 10 feet wide. Zones 5-6. Abies concolor 'Compacta' is a slow-growing selection with blue-green needles and reaches about 10 feet tall and 6 feet wide.