Calculate Your Arborvitae Needs
Choose your preferred unit of measurement for inputs and results.
The total length of the area you want to cover with arborvitae plants.
The expected width of your chosen arborvitae variety at maturity. (e.g., Emerald Green ~3-4 ft, Green Giant ~12-15 ft)
Enter a positive number for a gap between mature plants (e.g., 10 for 10% gap). Enter a negative number for an overlap (e.g., -10 for 10% overlap). 0% means plants touch at maturity.
Calculation Results
Note: The number of plants is rounded up to ensure full coverage. Actual spacing may be slightly adjusted.
| Mature Plant Width | Desired Gap/Overlap (%) | Center-to-Center Spacing (feet) | Plants for 50 ft Hedge |
|---|
What is an Arborvitae Spacing Calculator?
An arborvitae spacing calculator is an essential tool for anyone planning to plant an arborvitae hedge or privacy screen. It helps you determine the ideal number of arborvitae plants required for a given hedge length, taking into account the mature width of your chosen arborvitae variety and your desired spacing (whether you want plants to touch, overlap, or have a slight gap).
This calculator is crucial for:
- Home Gardeners: To ensure a lush, dense privacy hedge without over or under-planting.
- Landscape Designers: For precise planning and budgeting for arborvitae installations.
- Nurseries: To advise customers on optimal plant quantities.
A common misunderstanding is that all arborvitae varieties have the same mature width, leading to incorrect spacing. For example, Emerald Green Arborvitae is much narrower than a Green Giant Arborvitae, and their spacing requirements differ significantly. This calculator accounts for these variations, helping you avoid costly mistakes and ensure your hedge thrives.
Arborvitae Spacing Formula and Explanation
The calculation for arborvitae spacing is straightforward, focusing on the center-to-center distance between plants to achieve the desired coverage at maturity.
Here's the core formula:
Center-to-Center Spacing = Mature Plant Width × (1 + (Desired Gap/Overlap % / 100))
Number of Plants Needed = Ceiling(Desired Hedge Length / Center-to-Center Spacing)
Where `Ceiling` means rounding up to the nearest whole number to ensure full coverage.
Variables Explained:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Desired Hedge Length | The total linear distance you want your arborvitae hedge to cover. | Feet / ft | 10 - 500 feet (3 - 150 meters) |
| Mature Plant Width | The average width of a single arborvitae plant when it reaches its full size. | Feet / ft | 1 - 15 feet (0.3 - 4.5 meters) |
| Desired Gap/Overlap (%) | The percentage adjustment for spacing. Positive for a gap, negative for overlap. | Percentage (%) | -20% to +20% |
| Center-to-Center Spacing | The distance between the trunk of one plant and the trunk of the next. | Feet / ft | Varies greatly |
| Number of Plants Needed | The total count of arborvitae plants required. | Unitless (count) | 1 to 500+ |
Understanding these variables is key to using the arborvitae spacing calculator effectively to plan your landscape project.
Practical Examples
Let's look at a couple of scenarios to illustrate how the arborvitae spacing calculator works.
Example 1: Dense Privacy Hedge with Emerald Green Arborvitae
- Inputs:
- Desired Hedge Length: 60 feet
- Mature Plant Width (Emerald Green): 3 feet
- Desired Gap/Overlap: -10% (10% overlap)
- Calculation:
- Spacing Factor: 1 + (-10 / 100) = 0.9
- Center-to-Center Spacing: 3 ft * 0.9 = 2.7 feet
- Number of Plants: Ceiling(60 ft / 2.7 ft) = Ceiling(22.22) = 23 plants
- Results: You would need 23 Emerald Green arborvitae plants, spaced approximately 2 feet 8 inches apart center-to-center, to create a dense, overlapping privacy screen along a 60-foot length.
Example 2: Natural Screen with Green Giant Arborvitae
- Inputs:
- Desired Hedge Length: 100 meters
- Mature Plant Width (Green Giant): 4 meters
- Desired Gap/Overlap: 0% (plants touching)
- Calculation:
- Spacing Factor: 1 + (0 / 100) = 1
- Center-to-Center Spacing: 4 m * 1 = 4 meters
- Number of Plants: Ceiling(100 m / 4 m) = Ceiling(25) = 25 plants
- Results: For a 100-meter hedge using Green Giant arborvitae that touch at maturity, you would need 25 plants, spaced 4 meters apart center-to-center. This scenario demonstrates how the calculator adapts to metric units.
How to Use This Arborvitae Spacing Calculator
Using our arborvitae spacing calculator is simple and intuitive. Follow these steps for accurate results:
- Select Your Unit System: Choose between "Feet (ft)" or "Meters (m)" from the dropdown menu. All your inputs and results will then be displayed in your chosen unit.
- Enter Desired Hedge Length: Input the total length of the area you want your arborvitae hedge to cover. Be precise with your measurements.
- Input Mature Plant Width: Find out the mature width of the specific arborvitae variety you plan to plant. This information is usually available from the nursery or plant tag. Common varieties like Emerald Green (Thuja occidentalis 'Emerald Green') typically mature at 3-4 feet wide, while Green Giant (Thuja plicata 'Green Giant') can reach 12-15 feet wide.
- Specify Desired Gap/Overlap (%):
- Enter 0 if you want the plants to touch exactly at maturity, forming a seamless hedge.
- Enter a positive number (e.g., 10) if you want a gap between the mature plants (10% of their width). This is often used for a more natural, less formal look.
- Enter a negative number (e.g., -10) if you want the plants to overlap slightly at maturity (10% overlap). This creates a very dense privacy screen quickly.
- View Results: The calculator will instantly display the "Number of Arborvitae Plants Needed" as the primary result, along with intermediate values like "Recommended Center-to-Center Spacing" and "Individual Plant Gap/Overlap."
- Interpret Results: The "Number of Plants Needed" is rounded up to ensure full coverage. The "Recommended Center-to-Center Spacing" tells you how far apart to plant the trunks.
- Copy Results: Use the "Copy Results" button to easily transfer all your calculation details to a document or note.
Key Factors That Affect Arborvitae Spacing
Beyond the basic measurements, several factors influence optimal arborvitae plant spacing to ensure a healthy and effective hedge:
- Arborvitae Variety: As mentioned, different varieties (e.g., 'Emerald Green', 'Green Giant', 'Techny', 'Nigra') have vastly different mature widths and growth habits. Always use the mature width specific to your chosen variety.
- Desired Density/Purpose:
- Dense Privacy Hedge: Requires closer spacing, often with a slight overlap (-5% to -15% gap/overlap).
- Screen/Windbreak: Can tolerate plants just touching or a minimal gap (0% to +5%).
- Individual Specimen: Requires ample space for the plant to grow naturally without touching others (+20% or more).
- Growth Rate: Faster-growing varieties like 'Green Giant' will fill in gaps more quickly. Slower growers might benefit from slightly closer initial spacing if you desire a quick fill.
- Soil Quality & Sunlight: Optimal growing conditions (well-drained soil, adequate sunlight) lead to healthier, more vigorous growth, allowing plants to reach their mature size as expected. Poor conditions might stunt growth, affecting your desired density. Consider consulting a soil amendment guide for best results.
- Maintenance & Pruning: Regular pruning can help maintain a desired shape and density. If you plan heavy annual pruning to keep plants narrower, you might space them slightly closer.
- Budget: Closer spacing means more plants, which increases the overall cost. Balancing your desired outcome with your budget is often a practical consideration.
Frequently Asked Questions About Arborvitae Spacing
Q: Why is precise arborvitae spacing important?
A: Precise arborvitae spacing is crucial for several reasons: it ensures a uniform, dense hedge for privacy or screening; prevents overcrowding, which can lead to poor air circulation, increased disease susceptibility, and stunted growth; and optimizes your budget by avoiding over- or under-planting.
Q: What if my arborvitae variety isn't listed with a mature width?
A: If you can't find the exact mature width, consult your nursery or look up similar varieties online. Err on the side of slightly wider spacing if unsure, as you can always let them grow together, but you can't easily un-plant them if they're too close.
Q: Should I space 'Emerald Green' arborvitae differently from 'Green Giant' arborvitae?
A: Absolutely! 'Emerald Green' arborvitae typically matures at 3-4 feet wide, while 'Green Giant' arborvitae can reach 12-15 feet wide. This significant difference in mature width means they require vastly different spacing to achieve a similar hedge density. Always use the mature width specific to your chosen variety in the arborvitae spacing calculator.
Q: What does "0% gap/overlap" mean for spacing?
A: "0% gap/overlap" means that when your arborvitae plants reach their mature width, their foliage will just touch, creating a seamless, continuous hedge. This is a popular choice for privacy screens.
Q: Can I use inches or centimeters for the measurements?
A: While the calculator primarily uses feet or meters, you can convert your measurements. For example, if you have inches, divide by 12 to get feet. If you have centimeters, divide by 100 to get meters. The calculator will then perform calculations in the selected primary unit.
Q: What happens if I space my arborvitae too close together?
A: Spacing arborvitae too close can lead to several problems: reduced air circulation (increasing fungal disease risk), competition for nutrients and water, stunted growth, and the inner foliage dying off due to lack of light. It also makes future maintenance more difficult.
Q: What happens if I space my arborvitae too far apart?
A: Spacing arborvitae too far apart will result in gaps in your hedge, compromising its effectiveness as a privacy screen or windbreak. It will take much longer for the plants to grow together, if ever, and may require additional planting later, increasing costs.
Q: How do I adjust spacing for a corner or curved hedge?
A: For corners, treat each straight section as a separate length. For curved hedges, measure the length along the curve. The calculator provides linear spacing; for tight curves, you might need to slightly adjust individual plant positions manually after the calculation to maintain the curve's integrity while respecting the calculated center-to-center distances.
Related Tools and Internal Resources
Enhance your gardening and landscaping projects with these helpful resources:
- Arborvitae Care Guide: Learn about planting, watering, fertilizing, and pruning your arborvitae for optimal health.
- Privacy Hedge Options: Explore various plant choices for creating effective privacy screens in your yard.
- Garden Planning Tools: Discover other calculators and guides to assist with your garden design.
- Plant Growth Calculator: Estimate the growth rate and size of different plants over time.
- Soil Amendment Guide: Understand how to improve your soil for healthier plant growth.
- Watering Schedule Calculator: Determine the ideal watering frequency for your specific plants and climate.