Also known as American Arbor-Vitae · American Pillar · Arbor-Vitae
Thuja occidentalis, the northern whitecedar, is an evergreen conifer native to northeastern North America, prized for its dense foliage and adaptability.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun to Partial Shade
25% intensity
Thrives in full sun but tolerates partial shade. More sun generally leads to denser growth.
Consistent Moisture
50% intensity
Prefers moist soil but dislikes waterlogging. Water regularly, especially when young.
Clay, Loam, Sandy, Acidic, Alkaline, Well-drained
50% intensity
Cold Hardy
25% intensity
Very cold hardy, suitable for zones 3-7. Can tolerate heat but may require more water in hotter climates.
Light Feeder
25% intensity
Fertilize in early spring with a balanced evergreen fertilizer. Avoid over-fertilizing.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Non-toxic
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Thuja occidentalis prefers consistent moisture, especially when young. Water deeply when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.
Mature trees are more drought-tolerant but benefit from occasional deep watering during prolonged dry spells.
Prune to maintain desired shape and size, or to remove dead, damaged, or diseased branches. Light pruning can be done anytime, but heavier pruning is best in late winter or early spring before new growth starts.
Avoid cutting back into old wood, as it may not regrow.
Best propagated from semi-hardwood cuttings taken in summer or hardwood cuttings taken in late fall. Use a rooting hormone and plant in a well-draining medium.
Maintain high humidity and consistent moisture until roots form, which can take several weeks to months.
Younger plants may need repotting every 2-3 years to refresh soil and provide more space. Choose a pot that is slightly larger than the current one with good drainage. Use a well-draining potting mix.
Water thoroughly after repotting and place in a sheltered location.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Northern Whitecedar (Thuja occidentalis)
Where Northern Whitecedar (Thuja occidentalis) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Pinopsida |
| Order | Pinales |
| Family | Cupressaceae |
| Genus | Thuja |
| Species | Thuja occidentalis |
Similar in genus Thuja
Answers based on plant encyclopedia data
