The United States Department of Agriculture (USDA) winter hardiness zone 6 has an average annual minimum temperature between -10 to 0 degrees F. Zone 6 areas have spring weather from March 15 to May 15 and fall weather from September 15 to November 1. This zone runs through West Virginia, Kentucky, southern Kansas, northern Oklahoma and up through the middle of Washington. Winter hardiness zone 6 includes areas like St. Louis, Missouri; Lebanon, Pennsylvania; McMinnville, Tennessee; and Branson, Missouri.
American holly (Ilex opaca) is a slow growing upright tree with a natural pyramid form. This evergreen reaches 30 to 60 feet tall with shiny, green leaves. In spring, small white blossoms appear followed by red fruit in the fall. The red berries stay on the tree all winter long. American holly has female and male trees. American holly dislikes arid, windy and soggy areas.
Atlas cedar (Cedrus atlantica) is a slow growing evergreen tree that grows in a variety of soil types, as long as they drain well. This cedar tree has an abundance of blue-green needles and two to three inch, upright cones. Atlas cedar trees grow 40 to 60 feet tall and 30 to 40 feet wide. Atlas cedar trees look best when planted as a showcase tree.
Common boxwood (Buxus sempervirens) is a slow growing evergreen shrub that naturally forms a round shape. The dense foliage is dark green leaves that develop an orange tint during the winter. Fragrant, yellow flowers appear in spring. Common boxwood grows 15 to 20 feet tall and spreads 10 to 15 feet wide in good-draining soil. This shrub is tolerant of arid conditions.
English ivy (Hedera helix) is a rapidly growing evergreen vine that climbs to 50 feet high. Green, palmate leaves cover the stems and hide the aerial roots it uses to cling to upright supports. This vine produces blue-black berries in the fall when mature. When grown as a ground cover, English ivy smoothers other plants. The leaves burn and discolor when exposed to full sun.
Evergreen candytuft (Iberis sempervirens) is a ground cover growing to 12 inches tall and spreads three to four feet wide. The deep green leaves are narrow, lance-shaped. Evergreen candytuft produces mounds of white flower clusters from March to May. This ground cover adapts to any type of good-draining soil.