How to Select, Plant, and Maintain Arborvitaes in Your Landscape

Arborvitaes (Thuja occidentalis) are among the most versatile and resilient evergreen plants available to homeowners and landscape professionals. These fast-growing members of the cypress family offer dense, scale-like foliage, attractive conical growth habits, and remarkable adaptability to a wide range of soil conditions and climates. Whether you need a natural privacy screen, a windbreak along a property line, or a striking focal point in a garden bed, arborvitaes deliver reliable year-round greenery with relatively minimal effort. Selecting the right plant for your environment follows the same logic as understanding how moisture resistant greenboard performs in bathroom conditions: matching the material or variety to the specific site conditions determines long-term success.

Choosing the Right Arborvitae Variety for Your Space

Not all arborvitaes grow the same way, and selecting the right variety for your available space and climate is the most important decision you will make. The two most common types recommended by landscape professionals are Emerald Green and Thuja Green Giant, and they serve very different purposes. Much like understanding the structural differences between various oriented strand board grades in construction, knowing the growth habits of each arborvitae variety prevents costly mistakes down the road.

Emerald Green arborvitaes are compact, narrow trees that reach 10 to 15 feet in height with a spread of only 3 to 4 feet. Their bright green foliage holds its color through winter, making them excellent choices for smaller properties, tight corridors, and formal garden borders. The narrow upright growth habit allows planting as close as 3 feet apart for a dense hedge that does not overwhelm a modest yard.

Thuja Green Giant arborvitaes are much larger and faster growing. These trees reach 40 to 60 feet in height with a spread of 12 to 20 feet, and they put on 3 to 4 feet of new growth each year under ideal conditions. Their dark green, glossy foliage remains attractive year-round, and they are notably deer resistant, making them suitable for properties near wooded areas.

For colder regions, consider Techny arborvitaes, which offer excellent winter hardiness. In climates with high heat and humidity, Steeplechase and Green Giant varieties perform well and resist common fungal issues. Matching the variety to your climate zone and available space prevents the frustration of planting something that will either outgrow its location or struggle to thrive.

Best Practices for Planting Arborvitaes

Proper planting technique gives your arborvitaes the best possible start. Careful site preparation parallels the approach used in passive house construction strategies discussed by building science experts: getting the foundation right determines how well the structure performs over its lifetime.

Follow these steps when planting your arborvitaes:

1. Select a location with well-draining soil that receives at least six hours of direct sunlight each day. Arborvitaes tolerate partial shade but grow denser in full sun.
2. Dig a hole twice as wide as the root ball but exactly the same depth. Planting too deep is a common mistake that leads to stem rot and poor root development.
3. Remove the tree from its container and gently loosen any circling roots to encourage outward spread into the surrounding soil.
4. Place the arborvitae in the hole at the same depth it was growing in the container. The root ball top should be level with the surrounding soil grade.
5. Backfill with a mixture of native soil and compost. Avoid heavy amendments, as these can create a barrier that discourages root spread.
6. Water thoroughly to settle the soil and eliminate air pockets. Apply a 2 to 3 inch layer of organic mulch around the base, keeping it several inches away from the trunk.

Early fall is the ideal time for planting because warm soil encourages root growth while cooler air reduces stress. Space your arborvitaes according to their mature width, not their current container size. Proper spacing ensures good air circulation and reduces the risk of fungal diseases. Water newly planted arborvitaes every day for the first week, then every other day through the first summer. Deep watering encourages roots to grow downward, creating a strong anchoring system that makes the tree more drought tolerant once established.

Pruning and Shaping Techniques

Arborvitaes require less pruning than many other landscape plants, but strategic trimming keeps them healthy and well shaped. Good pruning practices matter in landscaping just as understanding the real performance characteristics of OSB matters in construction: working with the material’s natural properties yields better results than fighting them.

Key pruning guidelines to follow:

• Remove dead, damaged, or diseased branches as soon as you notice them, regardless of the season. Prompt removal prevents decay from spreading.
• For shape or size control, prune in early spring just before new growth emerges. This timing allows the plant to fill in quickly and hide the cuts beneath fresh foliage.
• When removing branches, cut at a V-shaped intersection where one branch meets another. This encourages natural-looking regrowth.
• For a formal hedge, shear the sides lightly in early spring. Keep the base slightly wider than the top so sunlight reaches the lower branches.
• For a natural appearance, let the plant grow with minimal intervention and remove only obviously out-of-place branches.

Avoid over-shearing arborvitaes with electric trimmers. Heavy shearing creates a dense outer shell that blocks sunlight from reaching the interior. Over time, the inside becomes bare wood with no green growth, making it impossible to prune back without creating unsightly gaps. Instead, take a rejuvenation approach by removing about one third of the oldest stems each year. This creates openings that allow sunlight to reach the center, encouraging fresh interior growth and maintaining a full, healthy appearance. Always use sharp, clean tools to avoid tearing bark and creating entry points for pests.

Year-Round Care and Winter Protection

Keeping arborvitaes healthy throughout the year requires attention to watering, fertilizing, and seasonal protection. These evergreens are relatively low maintenance, but targeted practices make the difference between survival and thriving. The same principle applies when selecting compatible materials like PEX pipes with soil treatments: understanding how environmental factors interact with your choices prevents problems before they start.

Once established, arborvitaes are relatively drought tolerant but benefit from deep watering during extended dry periods. A slow soak that penetrates 12 to 18 inches into the soil is far more effective than frequent light sprinklings, which encourage shallow root growth. Apply a slow-release, balanced fertilizer in early spring just before new growth begins. Avoid high-nitrogen formulas that produce weak, spindly growth susceptible to winter damage.

Winter protection is particularly important in colder climates. Arborvitaes continue to lose moisture through their foliage even when the ground is frozen, leading to desiccation and winter burn. Take these protective steps:

• Apply a 2 to 3 inch layer of mulch around the base before the ground freezes to insulate the roots.
• If heavy snow is expected, gently tie branches together with soft twine to prevent splaying. Remove ties in spring.
• Wrap vulnerable trees with burlap or install a windbreak in exposed locations to reduce moisture loss.
• Apply an anti-desiccant spray in November and reapply monthly through winter. Apply when temperatures are above 40 degrees Fahrenheit so the product dries on the leaf rather than freezing. The coating breaks down naturally by spring.

Avoid using de-icing salts near arborvitaes. Salt spray damages foliage and can kill roots. If salt exposure is unavoidable, consider a physical barrier or choose more salt-tolerant species for areas near driveways and walkways.

Managing Common Arborvitae Problems

Even with excellent care, arborvitaes face challenges from pests, diseases, and environmental stress. Recognizing problems early gives you the best chance of resolving them before they cause lasting damage. Like diagnosing why oversized air conditioners create humidity problems in buildings, identifying the root cause leads to effective solutions rather than temporary fixes.

Regular inspection is your best defense. Walk your arborvitaes monthly during the growing season and look for discoloration, unusual growth patterns, or insect activity. Catching a bagworm infestation with only a few bags is far easier than dealing with a population that has defoliated half the tree. Companion planting with ornamental grasses, hydrangeas, or hostas can also support arborvitae health by creating a more diverse landscape ecosystem that reduces pest concentration and improves soil health.

Integrating Arborvitaes into Your Landscape Design

Arborvitaes serve multiple functions beyond simple greenery. They define property boundaries, create outdoor rooms, buffer road noise, and provide shelter for birds and wildlife in winter. Their dense foliage makes them particularly effective as windbreaks, reducing heating costs by slowing cold winds before they reach the house. Year-round coverage adds structure to the garden during seasons when deciduous plants have dropped their leaves, ensuring visual interest in every month.

When planning your layout, think about how each tree will look at maturity, not just at planting time. A row of Emerald Green arborvitaes spaced 3 feet apart will eventually form a solid wall of green about 4 feet wide and 15 feet tall. That same row of Thuja Green Giants spaced 5 feet apart will become a towering screen over 40 feet tall within a decade. Planning for the mature size prevents the need for aggressive pruning or removal later. The same forward-thinking approach that guides innovative construction techniques like 3D printing in the building industry applies to landscape design: anticipating the final result informs better decisions at the planning stage.

With proper variety selection, correct planting techniques, and consistent seasonal care, arborvitaes reward you with decades of reliable greenery and structure. Their low maintenance requirements, fast growth, and adaptability make them one of the most practical choices for homeowners looking to enhance their property with living plants that deliver both beauty and function in equal measure.