Tall, slender evergreen trees add beauty to outdoor landscaping year-round. Narrow trees may be ideal for landscaping in small areas, but their underground systems may not be as narrow as their foliage. Even tall, slender trees may not be ideal for planting near buildings, as the root system may grow in a widespread pattern.
Columnar Italian cypress (Cupressus sempervirens "Stricta") grows as high as 90 feet. The foliage spreads as wide as 38 feet at the crown. Cypress trees should be grown in full sunlight. Though drought-tolerant, cypress trees prefer moist to dry soil. All cypress trees display columnar, tall growth and dark green foliage. Most cypress trees have greyish bark and narrow trunks.
Alaska cedar (Chamaecyparis nootkatensis) grows 30 to 50 feet tall. The Pendula cultivar has a cone-like shape and branches that grow upward to create a tall, slender form. White cedar (Thuja occidentalis) grows 20 to 30 feet high and 10 to 15 feet wide. Thuja occidentalis "Emerald" is a smaller cultivar of white cedar that grows only 10 to 15 feet in height and 3 to 4 feet in width. White cedar trees are cold-hardy and drought-tolerant.
White spruce (Picea glauca) is 10 to 20 feet wide at maturity and 40 to 60 feet tall. The foliage is pale green in colour and may be covered with a whitish substance that gives white spruce its name. The tree's form resembles a tall, slender spire. Serbian spruce (Picea omorika) is 20 to 25 feet wide and 50 to 60 feet tall. The needles of the Serbian spruce are glossy and dark green. The tree grows in a pyramid shape around a slender central trunk. Oriental spruce trees (Picea orientalis) also grow 50 to 60 feet tall with dense, dark green foliage in a narrow pyramid shape. Colorado spruce (Picea pungens) grow 10 to 20 feet wide and 30 to 60 feet tall. The needles are greyish or bluish in colour and grow on stiff branches.
Rocky Mountain juniper (Juniperus scopulorum) are native to USDA hardiness zone 3. The trees grow with a narrow, cone-like shape, 30 to 40 feet tall and 3 to 12 feet wide. The branches grow with an upright pattern, with deep green or bluish foliage. Gray Gleam has a very narrow, columnar form, growing 5 to 7 feet wide and up to 15 feet tall. The Medora cultivar grows a slender 3 feet wide and 10 to 12 feet tall. Irish yew trees (Taxus baccata "Fastigiata") grow 8 feet tall and 3 feet wide. Even without regular pruning, Irish yew trees maintain their upright, narrow form well.