Skip to content Skip to sidebar Skip to footer

Smaragd Secrets: Unlocking the Beauty and Benefits of Thuja Occidentalis Smaragd

Thuja Occidentalis Smaragd


Thuja Occidentalis Smaragd, commonly known as Smaragd or Emerald Green Arborvitae, is a popular evergreen tree known for its dense foliage and pyramidal growth habit. Originating from North America, this tree has been cultivated for centuries and prized for its versatility and beauty in the landscape.

Brief History of Thuja Occidentalis Smaragd

Thuja Occidentalis, also known as Eastern White Cedar or Northern White Cedar, is native to northeastern North America. The Smaragd cultivar was developed in Denmark in the 1950s and has since become a favorite among gardeners and landscapers worldwide for its attractive appearance and adaptability.

Common Names and Terminology

This tree is referred to by many names, including Thuja Occidentalis Smaragd, Emerald Green Arborvitae, Smaragd Arborvitae, White Cedar, and Northern White Cedar. The name "Smaragd" comes from the gemstone emerald, reflecting the tree's vibrant green color.

Thuja Occidentalis Smaragd is beloved for its year-round beauty, low maintenance requirements, and adaptability to various environmental conditions. It serves various purposes in the landscape, such as privacy screens, windbreaks, specimen plantings, and topiary forms.

Botanical Profile

Botanical Profile

Plant Description

Height and Width

Smaragd grows to an average height of 12 to 15 feet, with a width of 3 to 4 feet. It has a naturally pyramidal shape, which makes it an excellent choice for narrow spaces or as a focal point in the landscape.

Foliage and Color

The dense, scale-like foliage of Smaragd is a bright emerald green color that retains its vibrancy throughout the year. The foliage also has a pleasant aroma, which adds an additional sensory element to the garden.

Bark and Branches

The bark of Thuja Occidentalis Smaragd is reddish-brown and fibrous, peeling off in strips as the tree ages. The branches of the tree are numerous and closely spaced, contributing to its dense appearance.

Growth Habit and Rate

Pyramidal Shape

Smaragd naturally forms a symmetrical, pyramidal shape without the need for regular pruning. This shape makes it an excellent choice for formal gardens or landscapes that require a sense of structure and balance.

Dense Branching

The dense branching of Thuja Occidentalis Smaragd provides excellent screening and privacy. It also creates a safe haven for birds and other wildlife, making it a valuable addition to any garden.

USDA Hardiness Zones

Smaragd thrives in USDA Hardiness Zones 2 through 7, making it suitable for a wide range of climates across North America.

Tolerance to Various Environmental Conditions

Thuja Occidentalis Smaragd is highly adaptable to different environmental conditions. It tolerates various soil types, air pollution, and urban environments, making it an excellent choice for both urban and rural landscapes.

Planting and Care

Planting and Care

Site Selection

Sunlight Requirements

Smaragd prefers full sun to light shade, with at least six hours of direct sunlight per day for optimal growth and color.

Soil Preferences

Smaragd thrives in well-draining, loamy or sandy soils but is adaptable to various soil types. It prefers a slightly acidic soil pH of 6.0 to 6.5.

Planting Techniques

Container Planting

Container-grown Thuja Occidentalis Smaragd can be planted directly into the landscape by removing the container and placing the root ball into a prepared hole. Ensure that the top of the root ball is level with the surrounding soil.

Balled and Burlapped Trees

Balled and burlapped Smaragd trees can be planted by carefully removing the burlap and any wire or string surrounding the root ball. Place the root ball into a prepared hole, ensuring that the top of the root ball is level with the surrounding soil.

Watering and Irrigation

Smaragd requires regular watering, especially during the first few years after planting. Once established, it is moderately drought tolerant but will still benefit from supplemental water during extended dry periods.


Fertilize Thuja Occidentalis Smaragd in early spring with a balanced, slow-release fertilizer. Be sure to follow the package instructions for the appropriate application rate.

Pruning and Shaping

Pruning is not necessary for Smaragd, as it naturally maintains its pyramidal shape. However, if desired, light pruning can be done in late winter or early spring to remove any dead or damaged branches and maintain a specific shape or size.

Common Pests and Diseases

Smaragd is relatively pest and disease-resistant. However, it can be susceptible to bagworms, spider mites, and fungal diseases, such as root rot or branch cankers. Promptly address any issues to maintain the health and appearance of the tree.

Landscape Uses

Landscape Uses

Privacy Screens and Hedges

The dense, evergreen foliage of Thuja Occidentalis Smaragd makes it an excellent choice for privacy screens and hedges. Plant trees 3-4 feet apart to create a solid barrier.


Smaragd's dense branching and sturdy growth habit make it an effective windbreak, protecting more delicate plants or outdoor living spaces from strong winds.

Specimen Plantings

The striking pyramidal shape and vibrant green foliage of Smaragd make it a beautiful focal point in the landscape as a specimen planting.

Foundation Plantings

Smaragd's moderate size and evergreen nature make it a popular choice for foundation plantings, providing year-round interest and structure to the landscape.

Mixed Borders

Incorporate Thuja Occidentalis Smaragd into mixed borders with a variety of other trees, shrubs, and perennials to create a dynamic and visually appealing landscape.

Topiary and Sculptural Forms

Smaragd's dense foliage and ability to tolerate pruning make it an excellent candidate for topiary and sculptural forms, adding a unique element to any garden.

Propagation Techniques

Propagation Techniques


Seed Collection and Storage

Collect seeds from mature Thuja Occidentalis Smaragd cones in late fall or early winter. Store seeds in a cool, dry place until ready to sow.

Seed Germination and Sowing

Sow seeds in a well-draining seed-starting mix, covering them with a thin layer of soil. Keep the growing medium moist and provide a consistent temperature of 65-70°F for optimal germination.


Types of Cuttings

Semi-hardwood cuttings are the most successful method for propagating Thuja Occidentalis Smaragd. Take cuttings in late summer or early fall, selecting healthy, vigorous branches.

Rooting Hormone Use

Dip the cut end of the cutting into a rooting hormone powder to improve the chances of successful root development.

Potting and Transplanting

Place the treated cutting into a well-draining potting mix, keeping the growing medium moist but not waterlogged. Once the cutting has developed a strong root system, transplant it into the landscape.

Thuja Occidentalis Smaragd Varieties and Cultivars

Smaragd Varieties and Cultivars

Differences in Size and Shape

While Thuja Occidentalis Smaragd is known for its consistent pyramidal shape, various cultivars display differences in size and form, ranging from dwarf varieties to larger, more robust trees.

Foliage Color Variations

Some cultivars of Thuja Occidentalis Smaragd exhibit unique foliage colors, such as blue-green or golden-yellow, providing additional visual interest in the landscape.

Unique Growth Habits and Attributes

Select cultivars of Thuja Occidentalis Smaragd possess unique growth habits or attributes, such as weeping or twisted branches, adding an unexpected element to the garden.

Companion Plants

Companion Plants

Perennials and Annuals

Thuja Occidentalis Smaragd pairs well with a variety of perennials and annuals, such as hostas, ferns, and flowering bulbs, to create a lush and dynamic landscape.

Shrubs and Small Trees

Combine Smaragd with other evergreen or deciduous shrubs and small trees, like boxwood, holly, or dogwood, to create layers of texture and interest in the garden.

Vines and Climbers

Plant vines and climbers, such as clematis or climbing roses, near Smaragd to add vertical interest and contrast to the tree's dense, pyramidal form.


Surround Thuja Occidentalis Smaragd with low-growing groundcovers, like creeping thyme or sedum, to create a cohesive and visually appealing landscape design.

Wildlife Attraction

Wildlife Attraction


The dense foliage of Smaragd provides valuable shelter and nesting sites for birds, while the tree's small cones offer a source of food in the winter months.


While Thuja Occidentalis Smaragd is not a primary source of nectar or pollen for pollinators, its presence in the landscape can provide shelter and protection for beneficial insects like bees and butterflies.

Beneficial Insects

Smaragd's dense foliage creates a suitable habitat for beneficial insects, such as ladybugs and lacewings, which can help control pests in the garden.

Historical and Cultural Significance

Historical and Cultural Significance

Indigenous Uses and Folklore

Native American tribes have used various parts of Thuja Occidentalis for medicinal and ceremonial purposes, including treating respiratory ailments, fevers, and rheumatism.

Medicinal and Herbal Applications

In traditional herbal medicine, Thuja Occidentalis has been used for its antiviral, antifungal, and immune-boosting properties. However, it is essential to consult with a qualified healthcare professional before using Thuja for medicinal purposes.

Symbolism and Spiritual Significance

In some cultures, Thuja Occidentalis is considered a symbol of protection, purification, and longevity, often planted in sacred spaces or used in spiritual practices.

The Future of Thuja Occidentalis Smaragd

The Future of Thuja Occidentalis Smaragd

Breeding and Genetic Improvements

Ongoing research and breeding efforts aim to develop new cultivars of Thuja Occidentalis Smaragd with improved characteristics, such as increased disease resistance, unique growth habits, or enhanced ornamental qualities.

Climate Change Considerations

As climate change continues to impact our environment, Thuja Occidentalis Smaragd's adaptability to various conditions and its tolerance to environmental stressors make it a valuable plant for future landscapes.

Sustainable Gardening Practices

Incorporating Thuja Occidentalis Smaragd into sustainable gardening practices, such as water-wise landscaping or wildlife-friendly gardens, can contribute to a healthier and more resilient ecosystem.


Thuja Occidentalis Smaragd is a versatile and beautiful evergreen tree with numerous applications in the landscape. Its adaptability, low maintenance requirements, and year-round beauty make it an excellent choice for gardeners and landscapers alike.

Frequently Asked Questions

Can Thuja Occidentalis Smaragd be grown indoors?

Smaragd is not well-suited for indoor growth, as it requires ample sunlight and space to thrive. It is best grown outdoors in the landscape.

Are there any toxic or allergenic concerns to be aware of?

Thuja Occidentalis contains a compound called thujone, which can be toxic if ingested in large quantities. It is essential to keep children and pets away from the plant and avoid using Thuja as an herbal remedy without consulting a healthcare professional. Some individuals may also experience skin irritation or allergic reactions when handling the plant.

How long does it take for Thuja Smaragd to reach its mature size?

Smaragd has a moderate growth rate, typically taking 10 to 15 years to reach its mature size of 12 to 15 feet in height.

What are the best alternatives to Thuja Occidentalis Smaragd for similar landscape uses?

Some alternative evergreen trees with similar landscape uses include Leyland Cypress, Green Giant Arborvitae, and Japanese Cedar. Consult with a local nursery or landscape professional to determine the best options for your specific needs and growing conditions.

Post a Comment for "Smaragd Secrets: Unlocking the Beauty and Benefits of Thuja Occidentalis Smaragd"