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thuja occidentalis smaragd size

Thuja occidentalis 'Smaragd', also known as Green Cedar or Green Arborvitae, is a favourite choice for New Zealand gardeners wanting a formal, narrow evergreen screen or hedge. One of the most common questions about this conifer is, “What is the typical Thuja occidentalis Smaragd size?” Whether you’re planning a privacy hedge, feature specimen, or compact windbreak, understanding how tall and wide ‘Smaragd’ can grow, both at maturity and during its early years, is essential for making the most of your planting space.

Thuja occidentalis 'Smaragd' (Green Cedar)

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Green Cedar, Emerald Cedar, Green Arborvitae

Thuja 'Smaragd', commonly known as the Green or Emerald Cedar, grows with a narrow, dense, and columnar habit. The foliage is rich green, sometimes tinged bronze in winter, and produced with a somewhat layered effect to give the plant an interesting texture. It typically grows to 7 m in height and 2.5 m in width in full sun. Thuja 'Smaragd' is commonly included in a mixed planting, used as a backdrop for smaller plants, grown for shelter or screening, used for hedging, or planted to line an entranceway or avenue. It is excellent for providing an architectural element and suits being planted against a large, bland wall.

Thuja occidentalis 'Smaragd' hedge with bright green foliage.
  • Suited to regions:
    All regions
  • Plant type:
    Conifers
  • Height:
    7.00 m
  • Spread:
    2.50 m
  • Tolerances:
    Extended dry periods, Hardy
  • Garden uses:
    Containers, Hedging, Screening
  • Garden styles:
    Architectural, Backyard, City & Courtyard, Formal, Frontyard, Modern
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Thuja occidentalis 'Smaragd' (Green Cedar)

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Mature Size and Growth Rate

The typical mature Thuja occidentalis Smaragd size is 3 to 4 metres tall with a spread of 60 to 90 centimetres. This upright, narrow shape makes ‘Smaragd’ perfect for slender garden beds, narrow boundaries, or along fences where a column of rich green foliage is desired. In ideal New Zealand conditions, this arborvitae grows at a moderate rate, adding about 20 to 30 centimetres in height per year once established. Unlike some faster-growing conifers, Thuja 'Smaragd' is prized for maintaining its dense, crisp appearance without regular trimming.

Planting for Hedges and Screens

When using Thuja occidentalis 'Smaragd' for hedges or boundary planting, it’s important to space the plants according to their ultimate size. For a lush, seamless hedge, plant each tree approximately 60 to 75 centimetres apart. Within a few seasons, your hedge will fill in with vertical lines of vibrant green. Thanks to its refined size, ‘Smaragd’ is less prone to outgrowing its space, reducing maintenance compared to larger alternatives.

If you need a slightly broader or more pyramidal habit, consider Thuja occidentalis 'Pyramidalis', which exhibits similar hardiness with a different growth profile. For larger screening needs, Thuja 'Green Giant' is a vigorous selection capable of reaching much greater heights.

Ideal Uses for Thuja occidentalis 'Smaragd'

Because the typical Thuja occidentalis Smaragd size remains manageable, ‘Smaragd’ is excellent for foundation plantings, driveway lines, formal knot gardens, and both rural and urban privacy screens. Its bright emerald foliage holds colour through all seasons, offering year-round structure and a classic look.

Gardeners who love the tidy aesthetic of ‘Smaragd’ may also enjoy exploring Thuja occidentalis 'Rheingold', with its golden highlights, or Thuja plicata, which grows taller and broader for more expansive landscapes. Those interested in decorative dwarf evergreens might look at Abies balsamea Nana (Dwarf Balsam Fir) or Abies concolor Piggelmee for variety in the conifer garden.

Growing Conditions and Care

Thuja occidentalis 'Smaragd' thrives best in full sun to partial shade and prefers well-drained, fertile soil. While young, regular watering helps develop a strong root system; established plants boast excellent drought tolerance for New Zealand’s varying climate. Minimal pruning is required to maintain shape due to its disciplined, narrow growth.

Discover More Elegant Conifers

Ready to diversify your landscape? Alongside Thuja occidentalis 'Smaragd', discover elegant conifers like Cupressus sempervirens Stricta (Pencil Cypress), Araucaria angustifolia (Brazilian Pine), or gold-tipped Cupressocyparis Robinsons Gold for a unique evergreen collection.

Whatever your needs, knowing the typical Thuja occidentalis Smaragd size will help you select, plant, and maintain the perfect privacy hedge or garden feature for years to come.


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