Getting the spacing right for your giant green arborvitae is one of the most important decisions you will make in your landscape. Proper spacing for giant green arborvitae is critical for ensuring healthy growth, air circulation, and achieving your desired landscape effect. Plant them too close, and you’ll create a haven for disease and insect problems. Space them too far apart, and you’ll wait years for that lush, full privacy screen you wanted. This guide will walk you through everything you need to know to space your trees perfectly for their purpose.
Giant Green Arborvitae Spacing
The standard recommendation for spacing giant green arborvitae is based on their mature width. A mature ‘Green Giant’ arborvitae can reach 12 to 20 feet wide. For a traditional hedge or privacy screen where you want the trees to grow together into a solid wall, a spacing of 5 to 8 feet apart is common. If you are planting a single specimen tree, you need to provide ample room on all sides, at least 10 to 15 feet from structures or other large plants.
These numbers are a starting point. Your specific goal for the landscape will dictate the final spacing you choose. Consider the look you want, how quickly you need coverage, and the long-term health of the trees. Rushing to plant them close for instant gratification often leads to major issues down the road, requiring expensive removal or causing unsightly brown patches.
Key Factors Influencing Spacing Decisions
Before you dig a single hole, you need to assess a few key factors. These elements will help you fine-tune the standard spacing recommendations for your unique situation.
Mature Size and Growth Rate
Giant green arborvitae are fast-growing trees, adding 3 to 5 feet per year under ideal conditions. They are not small shrubs. Their potential mature height of 50 to 60 feet and width of 12 to 20 feet is the single most important factor. Always space for the mature size, not the size of the sapling you bring home from the nursery. Planting for the mature size prevents overcrowding and reduces competition for resources.
Purpose of Planting (Screen, Hedge, or Specimen)
Your intention for the trees is the biggest driver of your spacing plan.
- Privacy Screen or Windbreak: For a dense, continuous screen, space trees 5 to 8 feet apart, measured from the center of one trunk to the center of the next. This allows the canopies to knit together in a few years while still maintaining some air flow at the base.
- Formal Hedge: If you plan on shearing the trees into a neat, manicured hedge, you can space them slightly closer, around 4 to 6 feet apart. The regular trimming will control their natural spread.
- Specimen Tree: When planting a single giant green arborvitae as a focal point, give it room to showcase its natural, pyramidal shape. Plant it at least 10 to 15 feet away from your house, driveway, fences, and other large trees.
Soil Quality and Sunlight
Excellent growing conditions mean faster, lusher growth. In rich, well-drained soil with full sun, your trees will reach their maximum size more quickly. In these cases, leaning toward the wider end of the spacing range (e.g., 8 feet for a screen) is a smart choice to account for robust growth. In poorer soil or partial shade, growth may be slower, but you should still space for the ideal mature size to avoid future problems.
Step-By-Step Spacing Guide For Different Landscape Goals
Now, let’s translate those factors into actionable steps. Follow this guide to measure and mark your planting site correctly.
Measuring and Marking for a Privacy Screen
- Determine Your Line: Use a string line or garden hose to lay out the straight (or curved) line where you want the center of your screen.
- Calculate the Number of Trees: Measure the total length of your line. Divide that length by your chosen spacing (e.g., 6 feet). This gives you the number of trees needed. For a 60-foot line spaced 6 feet apart: 60 / 6 = 10 trees.
- Mark the Spots: Starting at one end, use a measuring tape along the string to mark each planting location. Drive a small stake into the ground at each mark. A spacing of 6 feet on center is a very reliable choice for a balance of speed and health.
- Check for Obstructions: At each stake, check for underground utilities (always call 811 first) and overhead power lines. Ensure the future canopy will not interfere with structures.
Spacing for a Single Specimen Tree
Planting a solo giant green arborvitae is simpler but requires a different perspective. Imagine the tree at its full 20-foot width. Use a long tape measure to ensure there is at least 10 feet from the trunk’s planting location to any permanent structure, like your house foundation, sewer line, or patio. This prevents root damage and ensures the tree never overwhelms your home’s architecture. Also consider the height; avoid planting directly under power lines.
The Consequences Of Incorrect Spacing
Ignoring spacing guidelines leads to predictable and serious issues. It’s a common mistake that can compromise your entire landscape investment.
Problems From Planting Too Close
- Increased Disease and Pest Pressure: Poor air circulation creates a damp, humid environment that fosters fungal diseases like blight and pest infestations like spider mites. The inner foliage browns and dies out.
- Intense Resource Competition: Roots and branches become entangled, fighting for water, nutrients, and sunlight. This stunts growth and can lead to thin, weak trees.
- Expensive Corrections: In 5-10 years, you may face the costly and difficult task of removing every other tree, leaving unsightly gaps or damaged remaining trees.
- Unattractive Appearance: Instead of a full, healthy screen, you get a tall, skinny, and brown-bottomed wall of foliage.
Problems From Planting Too Far Apart
While less damaging to tree health, spacing trees too wide apart defeats the purpose of a screen. You will have significant gaps for many years, reducing privacy and visual impact. It also wastes potential landscape space. The trees may develop broader, bushier shapes individually, but they will never form that cohesive, green wall.
Long-Term Care And Maintenance Related To Spacing
Proper spacing sets the foundation, but ongoing care is influenced by your initial layout. Here’s what to expect as your correctly spaced trees mature.
Pruning Strategies for Managed Growth
Even with good spacing, some light pruning is beneficial. For a screen, you can lightly tip-prune the leading shoots annually to encourage denser branching. Avoid shearing the sides heavily if you want the trees to touch; let them grow into each other naturally. For a specimen tree, pruning is usually limited to removing any dead or damaged branches to maintain its tidy shape.
Watering and Fertilizing Considerations
Newly planted trees need consistent watering for the first two years. A soaker hose run along the planting line is efficient. Once established, their water needs decrease. Fertilize in early spring with a balanced, slow-release fertilizer formulated for evergreens. Well-spaced trees have better access to soil nutrients, so they often require less supplemental feeding than crowded ones.
FAQ About Giant Green Arborvitae Spacing
How far from my fence should I plant giant green arborvitae?
Plant the trunk of the tree at least 4 to 6 feet away from the fence line. This accounts for half of the tree’s mature spread, preventing the foliage from pushing against and damaging the fence as it grows. It also allows you room to get behind the trees for maintenance if needed.
Can I plant giant green arborvitae 4 feet apart?
You can, but it is not generally recommended for long-term health. A 4-foot spacing will create a very dense screen quickly, but it significantly increases the risk of disease, inner foliage die-back, and intense competition. It is a better practice for a formally sheared hedge where you will constantly control the size.
What is the best time of year to plant these trees?
The ideal times are early fall or early spring. This allows the tree to establish its root system in cooler, moist conditions before the stress of summer heat or winter freeze sets in. Avoid planting in the peak of summer or the frozen ground of deep winter.
How long does it take for them to form a privacy screen?
With proper spacing (5-8 feet apart), good soil, and adequate water, you can expect a reasonable screen in about 3 to 5 years. The trees will fill in and touch, creating an effective visual barrier. For a completely dense, opaque screen from top to bottom, it may take 7 to 10 years of growth.
Do I need to amend the soil when planting?
It is usually best to plant them in the native soil you have. Amending just the planting hole can create a “bathtub effect” where water pools. If your soil is very poor (heavy clay or pure sand), mix in some compost over a broad planting area, not just in the hole. They are adaptable trees but prefer well-drained soil.
Final Recommendations And Best Practices
To ensure success, always start with a plan. Sketch your yard, mark your property lines, and note all structures. When in doubt, err on the side of wider spacing. It is much easier to plant a small, fast-growing shrub in a gap for a few years than it is to remove a massive, crowded evergreen. Remember that calling 811 to have underground utility lines marked is a crucial free service and a legal requirement in many areas before you dig.
Investing time in planning your giant green arborvitae spacing is an investment in the future beauty and health of your landscape. By giving these magnificent trees the room they need, you are guaranteeing a stunning, trouble-free green backdrop for your home for decades to come. The patience you show at planting time will be rewarded with a robust, low-maintenance screen that enhances your property’s value and your personal enjoyment of the space.