Eastern Arborvitae
Thuja occidentalis
Smaragd
About this plant
Thuja occidentalis, commonly called Eastern Arborvitae, is a popular evergreen tree known for its dense, flat sprays of scale-like leaves and conical shape. It is often used as a privacy hedge or ornamental tree in gardens. It grows relatively fast and can reach impressive heights, providing year-round greenery.
Taxonomy
- Genus
- Thuja
- Family
- Cupressaceae
- Higher classification
- Order: Pinales
- Plant type
- Tree
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Northeastern United States, Southeastern Canada
- Distribution
- Native to northeastern North America, widely cultivated in temperate regions worldwide.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- North-facing, East-facing, West-facing
- Watering frequency
- Moderate
- Watering interval
- 4–10 days
- Humidity
- Normal
- Minimum
- -40 °C
- Maximum
- 35 °C
- Optimal
- 15-25 °C
- USDA hardiness zones
- 3-7
- Soil pH
- 6.0-8.0 (slightly acidic to neutral)
- Soil type
- well-draining loam, sandy or clay soils
Watering. Water regularly during the first few years to establish roots. Once established, it tolerates some drought but benefits from occasional deep watering.
Fertilizing. Apply a balanced, slow-release fertilizer in early spring to support healthy growth. Avoid over-fertilizing, which can cause excessive, weak growth.
Thuja occidentalis is a hardy evergreen tree that grows well in many conditions. It prefers well-drained soil and can tolerate both full sun and partial shade. It needs regular watering when young but becomes more drought-tolerant as it matures. Pruning helps maintain its shape and encourages dense growth.
Propagation
- Propagation methods
- Cuttings, Seeds
- Care difficulty
- Easy
Ornamental features
- Flowering
- No
Dense, flat sprays of green scale-like leaves; conical form; attractive bark; used for hedges and screens.
Toxicity & Safety
- Toxic to humans
- Mildly toxic
- Toxic to pets
- Mildly toxic
- Weed potential
- Not considered a weed
Sap can cause skin irritation; keep away from children and pets to avoid ingestion which may cause mild stomach upset.
Allergy information
- Allergy risk
- Moderate
- Allergy triggers
- Pollen, Sap or latex, Skin contact
- Pollen level
- Moderate
Thuja occidentalis can cause allergic reactions in some people, especially from its pollen and sap. Those sensitive to tree pollen or with skin allergies should handle it carefully. Wearing gloves and avoiding direct contact with sap can help reduce reactions.
Common problems
Common problems include browning from drought or poor drainage, and occasional pest issues like spider mites or bagworms if not monitored.
Uses
Used mainly as an ornamental tree for hedges, windbreaks, and privacy screens. Also valued for its evergreen foliage in landscaping.
Notes
Prune in late spring or early summer to maintain shape. Avoid heavy pruning into old wood as it may not regrow. Repotting is rarely needed as it is usually grown outdoors.