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.
The leaves of deciduous shrubs change colors in the fall season before falling. The bare shrubs add a different type of interest to the landscape during the winter months. In the spring, new leaves form to add color, shape and texture to the garden. St. John's wort (Hypericum kalmianum), serviceberry (Amelanchier spp.) and Kelsey dogwood (Cornus sericea) are a few types of deciduous shrubs.