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.
Plant evergreen ornamental varieties for year-round specimen plants. Grasses include blue oat grass (Helictotrichon sempervirens) and tall blue fescue (Festuca amethystine). Blue oat grass is a semi-evergreen fountain grass. It grows well in zones 4 through 9 and needs dry, well-drained soil.
Image by HannamariaH. There are numerous types of landscaping shrubs. They can range in size from the smaller forms on up to the larger tree-like varieties. There are evergreen shrubs, which retain their color and leaves year round, and there are deciduous shrubs, which eventually lose their foliage after putting on a colorful fall show.