Cupressaceae
Oriental Arborvitae (Thuja orientalis)
Thuja orientalis
A low-maintenance evergreen conifer that thrives in full sun with well-draining soil. Drought-tolerant once established. Water regularly during the first year; prune lightly every 6 months to maintain shape. Fertilize once per season with a balanced fertilizer. Protect young plants from heavy snow loads.
Every 7 days
Direct sun
-15° - 38°C
30% - 60%
Categories
What is Oriental Arborvitae?
Oriental Arborvitae (Thuja orientalis) is a easy-care plant from the Cupressaceae family. Oriental Arborvitae (Thuja orientalis, accepted name Platycladus orientalis) is an evergreen conifer native to northeastern Asia, particularly China and Korea. It forms a naturally pyramidal or egg-shaped silhouette with distinctive vertical, flat, scale-like foliage arranged in book-like planes. Wi...
Oriental Arborvitae grows up to 15.0m, with spread of 500cm, watering every 7 days, -15°C – 38°C, 30–60% humidity. It is not suitable for indoor environments and not safe for pets.
Unlike many tropical plants, Oriental Arborvitae tolerates watering mistakes. Best for beginners. Without precautions, ingestion can cause irritation in pets. Keep out of reach of cats and dogs.
How to Care for Oriental Arborvitae?
TLDR: Oriental Arborvitae needs Direct sun, watering every 7 days, and temperatures between -15-38°C with 30-60% humidity.
How Often Should You Water Oriental Arborvitae?
Water newly planted specimens 2–3 times per week in summer and every 5–7 days in cooler months. Once established, the plant is drought-tolerant and can survive on weekly deep watering. Avoid waterlogging — ensure excellent drainage to prevent root rot.
How Much Light Does Oriental Arborvitae Need?
Requires full sun with at least 6 hours of direct sunlight per day. Avoid planting in shade or partial shade, as reduced light causes loss of density, weak growth, and increased disease susceptibility.
What Is the Best Soil for Oriental Arborvitae?
Plant in well-draining, loamy soil with a pH of 6.0–8.0. Tolerates sandy, loamy, and even clay soils as long as drainage is adequate. Amend heavy soils with perlite or coarse sand. Never allow the root zone to remain waterlogged.
What Pot Should You Use for Oriental Arborvitae?
Terracotta or wooden planters are ideal for bonsai cultivation. For landscape use, plant directly in the ground. Container specimens benefit from frost protection in colder climates.
Care Schedule
Fertilize
Every 90 days
What Is Oriental Arborvitae and Where Does It Come From?
Oriental Arborvitae (Thuja orientalis, accepted name Platycladus orientalis) is an evergreen conifer native to northeastern Asia, particularly China and Korea. It forms a naturally pyramidal or egg-shaped silhouette with distinctive vertical, flat, scale-like foliage arranged in book-like planes. Widely used as a hedge, windbreak, specimen tree, and popular bonsai subject, it has been cultivated in Chinese gardens and near temples for centuries due to its association with longevity and resilience.
How to Propagate Oriental Arborvitae?
Semi-ripe Cutting
Use clean, sharp pruning shears to avoid crushing the stem. Keep the medium evenly moist but not soggy. Rooting takes 6–8 weeks.
- 1 Take a 10–15 cm semi-ripe cutting from healthy current-season growth in summer.
- 2 Remove foliage from the lower third of the cutting.
- 3 Dip the cut end in rooting hormone powder or gel.
- 4 Insert into a mix of perlite and peat moss or coir.
- 5 Keep in a humid environment with indirect light until rooted.
Materials needed:
Seed Propagation
Cold stratification is essential for good germination rates. Seedlings grow slowly in the first year.
- 1 Collect ripe seeds in autumn (September–October).
- 2 Cold-stratify seeds at 4°C for 4–8 weeks before sowing.
- 3 Sow in spring in a well-draining seed mix.
- 4 Maintain consistent moisture and warmth (18–22°C).
- 5 Transplant seedlings once they reach 5–8 cm.
Materials needed:
How Big Does Oriental Arborvitae Grow?
TLDR: Oriental Arborvitae can reach up to 15.0m tall with Slow growth rate.
Max height
15.0m
Spread
5.0m
Growth rate
Slow
Foliage
Evergreen
Warning: Toxic Plant
This plant can be toxic if ingested. Keep out of reach of:
Plant Uses
Ornamental
Great for decoration
Medicinal
Medicinal properties
Aromatic
Pleasant fragrance
Medicinal Uses
- Leaves used in traditional Chinese medicine for coughs, hemorrhages, bronchitis, asthma, and skin infections
- Seeds used for palpitations, insomnia, and nervous disorders
- Root bark used for burns
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Oriental Arborvitae?
TLDR: Oriental Arborvitae is susceptible to 7 known diseases. Monitor regularly for early detection.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
Spider Mites
Spider mites are tiny arachnids (less than 1/20 inch long) related to spiders and ticks that feed on plant sap. They thrive in hot, dry conditions and can cause significant damage to ornamental and vegetable plants. During severe infestations, crop losses can reach 14% or higher as these pests disrupt vital plant processes including photosynthesis, carbon dioxide absorption, and transpiration.
Aphids
Aphids are small, soft-bodied, pear-shaped insects (1/16 to 1/8 inch long) that feed by sucking nutrient-rich sap from plants. They reproduce rapidly and can quickly weaken plants, causing distorted growth and transmitting plant viruses. Aphids come in various colors including green, black, red, yellow, brown, and gray. They secrete honeydew, a sticky substance that attracts ants and encourages sooty mold growth.
Scale Insects
Scale insects are small sap-sucking pests that appear as brown, shell-like bumps on plant stems and leaves. There are over 25 species, divided into armored (hard) and unarmored (soft) scales. They feed by piercing plant tissue and extracting sap, which weakens the plant and can lead to yellowing, stunted growth, and even death if left untreated. They also excrete honeydew, which attracts ants and promotes sooty mold growth.
Meaning & Symbolism
In East Asian cultures, the Oriental Arborvitae symbolizes longevity, endurance, and resilience. It has been planted near temples and sacred sites in China for centuries, representing spiritual constancy and immortality.
Fun Facts
Thuja orientalis is one of the oldest cultivated conifers in China, with a history in temple gardens exceeding 3,000 years.
The currently accepted scientific name is Platycladus orientalis — it is the only species in its genus.
Its wood is highly durable and has been used in traditional Chinese construction and cabinet-making for centuries.
Oriental Arborvitae does not regenerate from old wood — pruning should always leave some green foliage on each branch.
Frequently asked questions
How often should I water Oriental Arborvitae?
Is Thuja orientalis the same as Platycladus orientalis?
Is Oriental Arborvitae toxic to pets?
Can I grow Oriental Arborvitae as a bonsai?
What diseases affect Oriental Arborvitae?
Compare with similar plants
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|---|---|---|---|---|
| Peace Lily | Easy | Low light | 4d | ⚠️ |
| Swiss Cheese Plant | Easy | Partial shade | 10d | ⚠️ |
| Golden Pothos | Easy | Low light | 8d | ⚠️ |
| ZZ Plant | Easy | Low light | 18d | ⚠️ |
