Tall Skinny Trees for Privacy in Narrow Side Yards

The most common privacy-planting mistake in a narrow side yard is choosing a tree for its height and ignoring its width. A spruce or standard arborvitae that looks slim at the nursery can spread 10 to 15 feet across, swallowing a walkway and pushing against the house. Tall skinny trees, the columnar or fastigiate forms that stay roughly 2 to 5 feet wide at maturity, give you a screen without eating the space between buildings.

These trees are ideal along driveways, fence lines, tight property boundaries and the gap between your house and the neighbor’s. Planted at the right spacing, they knit into a living wall in a few years. Choose wrong, though, and you are left with gaps, roots near the foundation or a row that splays open after the first heavy snow.

Here is how to read a plant tag for mature width, how close to plant for a solid screen, how far to keep trees from foundations and utility lines, and how to keep upright evergreens from flopping open in winter.

What Makes Tall Skinny Trees Work in Tight Spaces

Columnar trees grow with branches that point mostly upward instead of outward. Nurseries label them with terms like columnar, fastigiate, narrow, pencil or upright. Many popular choices are cultivated forms of familiar species, so you can find tall narrow trees for privacy in evergreen and deciduous types for most US climates.

Common groups to look for include:

• Columnar arborvitae: dense evergreen foliage, often 3 to 5 feet wide and 12 to 20 feet tall. Tall skinny arborvitae forms are the most widely planted privacy screen in cool and moderate climates.
• Columnar junipers: very narrow, often 2 to 4 feet wide, drought tolerant and suited to sunny, dry sites.
• Italian-type cypress and other narrow cypress: pencil-thin profiles for hot, dry climates with mild winters.
• Upright yew and podocarpus forms: tolerate more shade and take shearing well.
• Columnar deciduous trees: narrow forms of hornbeam, oak, beech, maple and flowering pear. These give summer screening and seasonal color but lose privacy in winter.
• Narrow hollies: upright evergreen hollies offer glossy foliage and, on female plants, winter berries.

Climate fit matters as much as shape. Check the plant’s cold hardiness range against your region, and think about summer heat, humidity, rainfall and soil drainage. Many narrow cypress types struggle in cold, wet winters, while some arborvitae fade in hot, dry climates. A local nursery or cooperative extension office can tell you which tall evergreens for privacy perform reliably where you live.

Reading Mature Size: Width Matters More Than Height

Every plant tag lists a mature height and spread, usually based on 10 years of growth. Many trees keep growing after that, so treat the numbers as a minimum.

• Width: For a side yard 6 to 10 feet wide, choose trees with a listed spread of 4 feet or less so you keep a usable path.
• Height: Decide how high the screen really needs to be. Blocking a second-story window may need 15 to 20 feet, while screening a patio may need only 8 to 10.
• Growth rate: Fast growers fill in quickly but can be weaker-wooded or shorter-lived. Moderate growers often look better long term.

Look for a cultivar name on the tag rather than just the species. A generic species may grow two or three times wider than its narrow cultivated form.

Spacing for a Solid Privacy Wall

For a continuous screen, space trees at roughly half to three-quarters of their mature width, measured center to center. That means:

• Trees with a 3-foot spread: plant about 2 to 2 1/2 feet apart
• Trees with a 4-foot spread: plant about 2 1/2 to 3 feet apart
• Trees with a 5-foot spread: plant about 3 to 4 feet apart

Closer spacing gives a faster screen but means more competition for water and light, and some lower branches may thin out over time. If you have room, a staggered double row, with trees offset in a zigzag pattern, fills in faster and looks more natural than a single straight line.

Safe Distances From Foundations, Fences and Utilities

Even narrow trees have roots that spread well beyond the branch line, and their canopy will still touch anything planted too close.

• Foundations and siding: Plant at least half the mature width plus 2 to 3 feet from the wall. For a 4-foot-wide tree, that means a trunk at least 4 to 5 feet from the house. This leaves airflow so siding dries and allows room to paint or repair.
• Fences and property lines: Keep trunks at least 2 to 3 feet inside your line so branches do not overhang the neighbor. Check local rules and HOA guidelines, since some communities limit hedge height or placement.
• Driveways and walkways: At least 3 feet from paving to limit root lifting and leave room for car doors.
• Overhead lines: Do not plant trees whose mature height reaches power lines. Choose shorter forms under any wires.
• Underground utilities: Gas, water, sewer, electric and communication lines often run along side yards. Call 811 a few business days before digging so utilities can mark buried lines for free.
• Septic systems: Keep trees well away from drain fields, since roots seek out moisture in the lines.

Tools and Materials

• Round-point shovel and garden spade
• Tape measure, stakes and string for laying out the row
• Hand pruners for trimming broken roots or branches
• Compost (only for blending lightly with native soil)
• Shredded bark or wood chip mulch
• Soaker hose or drip line
• Tree staking kit with soft, flexible ties, for windy sites
• Gloves and eye protection

Planting Tall Skinny Trees Step by Step

1. Call 811 and wait for marks. Plan your row around any flagged utilities.
2. Lay out the row. Run a string line at the correct distance from the house or fence, and mark each planting spot at your chosen spacing.
3. Dig wide, not deep. Make each hole two to three times as wide as the root ball and only as deep as the root ball, so the top of the root flare sits at or slightly above grade.
4. Loosen the roots. Tease apart circling roots on container plants. For burlapped trees, remove twine and fold back or cut away burlap from the top and sides once the tree is in the hole.
5. Backfill with native soil. Mix in only a little compost if any. Firm gently to remove air pockets without packing hard.
6. Water deeply. Soak the root zone right after planting.
7. Mulch. Spread 2 to 3 inches of mulch in a wide ring, keeping it a few inches away from the trunk.
8. Stake only if needed. In windy, exposed spots, stake tall trees loosely for the first year, then remove the ties so the trunk can strengthen.

Water new trees deeply once or twice a week through the first growing season, more often in hot, dry spells, and continue during dry periods for the first two to three years. Evergreens also benefit from a deep watering in late fall before the ground freezes.

Preventing Snow Splay and Winter Damage

Multi-stemmed columnar evergreens, especially arborvitae and junipers, can splay open under heavy, wet snow or ice. Once bent, stems may never fully return upright, leaving gaps in the screen.

• Brush snow off gently with a broom, sweeping upward, after each heavy storm. Do not shake frozen branches, which can snap them.
• In snowy regions, wrap the tree loosely in late fall with soft garden twine or wide tree tape in a spiral from bottom to top, and remove it in spring.
• For trees already splayed, tie stems together with soft, wide strap material placed about two-thirds of the way up, and check ties regularly so they do not girdle the bark.
• Choose single-leader forms in heavy-snow climates when available.

Winter sun and wind can also cause browning on evergreens. Deep fall watering and a mulch layer reduce this stress.

Troubleshooting and Costs

• Browning at the base: Often too little light from crowding, or reflected heat and salt near driveways.
• Yellowing or thinning overall: Check for poor drainage, overwatering or planting too deep.
• Gaps that will not fill: Spacing was too wide or a tree died. Plant a replacement of similar size, or add a staggered second row.
• Trees growing wider than expected: Light shearing in late spring keeps many columnar evergreens compact.

Container trees in the 4 to 6 foot range commonly cost $40 to $150 each, while larger balled-and-burlapped trees of 7 to 10 feet can run $150 to $500 or more. Professional installation for a row of privacy trees often adds $50 to $200 per tree depending on size and access.

When to Call a Licensed Professional

Bring in a licensed landscape contractor or a certified arborist for large balled-and-burlapped trees, which can weigh several hundred pounds, for planting on slopes or near retaining walls, and for any site near overhead power lines. Utility companies and arborists trained for line clearance should handle any work near energized wires. If 811 marks show lines running through your planned row, a professional can help redesign the layout. Check with your local building department or HOA for any permits, setback rules or height limits before planting along a property line.