How to Grow Golden Smaragd
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Golden Smaragd
Thuja occidentalis 'Golden Smaragd'
shrubGolden Smaragd is a narrow, columnar evergreen conifer that features bright golden-yellow foliage, particularly vibrant in spring and fall. It maintains a dense, compact form and grows slowly to moderately, making it ideal for screens, windbreaks, and ornamental hedges. This cultivar is a sport of the popular 'Emerald Green' arborvitae, offering similar form with striking color.
When should you plant Golden Smaragd in your zone?
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Example Golden Smaragd timeline · Pittsburgh, PA (Zone 6b)
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Plant Golden Smaragd
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Golden Smaragd
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-8, with best color in zones 3-7
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Get my Golden Smaragd timeline →Growth Stages
Establishment
First yearYoung plant with compact pyramidal form, bright golden foliage, establishing root system
Keep consistently moist, mulch around base, protect from strong winds and salt spray, stake if necessary for tall nursery specimens
Early Growth
Year 2-3Foliage intensifies in color, plant fills out, narrow columnar form becomes more pronounced
Continue regular watering, prune lightly to encourage density if desired, apply balanced slow-release fertilizer in spring
Mature Development
Year 3-5 and beyondPlant reaches mature height (15-20 feet), maintains dense columnar shape, golden color peak in spring and autumn
Water during drought, apply mulch, minimal pruning needed, monitor for spider mites in dry conditions
Seasonal Color Changes
Seasonal cycle each yearGolden hue becomes most vibrant in spring growth and fall/winter, may take on bronzed tone in extreme cold
Expect color variation with seasons and temperature; full sun exposure maintains brightness; protect from winter wind burn
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge, apply horticultural oil or neem oil, maintain humidity around plant, avoid hot dry conditions
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Hand-pick bags in fall/winter, apply Bt (Bacillus thuringiensis) in early summer when caterpillars emerge, insecticidal soap
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Prune out infested tips, apply dormant oil in early spring, insecticidal soap during growing season
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Apply horticultural oil in dormant season, insecticidal soap in growing season, prune heavily infested branches
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Install physical barriers or fencing, apply deer repellents, plant in less accessible areas
Uses
Screening and Privacy Hedges
OrnamentalGolden Smaragd's narrow columnar form and dense foliage make it ideal for creating privacy screens and windbreaks in narrow spaces. The golden color adds visual interest to landscapes while maintaining functional screening. [source]
Specimen Plant & Year-Round Color
OrnamentalThe striking golden-yellow foliage, especially vibrant in spring and fall, makes this cultivar an excellent focal point in residential and commercial landscapes. Provides color and structure throughout winter months when other plants are dormant. [source]
Windbreak & Shelter Belt
HouseholdThe dense branching habit and columnar form provide effective wind protection for buildings and gardens, and Golden Smaragd withstands exposure well in northern climates and coastal environments. [source]
Shelter for Birds
WildlifeDense evergreen foliage provides year-round shelter and nesting habitat for songbirds and other wildlife, while the structure offers protection from predators. [source]
Cut Greenery for Arrangements
CraftBranches can be harvested for fresh flower arrangements and holiday decorative displays, adding textural interest and golden-hued evergreen elements to floral designs. [source]
Harvest Tips
Golden Smaragd is not typically harvested for consumption. For ornamental purposes, prune in early spring (March-April) or late summer to maintain shape and density. Remove any dead or diseased branches promptly. Avoid heavy pruning in fall to prevent winter damage.
Fun Facts
- 🌱 Golden Smaragd is a natural mutation (sport) discovered on the cultivar 'Emerald Green,' inheriting the same narrow columnar form while displaying bright golden-yellow foliage. The mutation occurred spontaneously in a nursery and was propagated for its ornamental appeal.
- 🌱 Unlike many conifers with golden foliage that can scorch or burn in intense sun, Golden Smaragd actually requires full sun to develop its most vibrant golden color—shade causes the foliage to revert toward greenish tones.
- 🌱 The name 'Smaragd' comes from the German word for 'emerald,' reflecting its heritage as a golden sport of 'Emerald Green.' Despite the name reference to emeralds, it was specifically bred for its glowing golden appearance rather than green hues.
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