Keep the garden vertical. That's why it's good to look for shrubs and trees that max out interest as they grow up, not out. Try dwarf varieties for a small backyard, as well as more columnar evergreens (bonus—they boost wintertime interest, too).
Arborvitae (Thuja occidentalis) - mature width, plant 3 to 4 feet apart. Measure the height and width of the largest root ball. Then use spray paint to mark out a trench that is two to three times wider and 2 inches shallower than the root ball.
Means unchanging friendship 🍪 Growing emerald green arborvitae is a popular option to help you screen your home from prying eyes. This Buzzle article tells you how to care for your large conifers so that they keep looking beautiful and healthy.