Genus guide
Thuja — 17 species
Part of the Conifers family (Pinophyta)
Thuja is a genus of coniferous evergreen trees and large shrubs — including Arborvitae, Western Red Cedar, Chinese Arborvitae, and Japanese Arborvitae — widely used for hedging, screening, and specimen planting. They are sun-lovers requiring full to partial sun and regular watering when young, settling to about half an inch per week once established; good drainage is essential as they dislike waterlogged roots. Toxicity varies across the genus: the essential oils, particularly thujone concentrated in foliage, cones, and wood, can cause vomiting, drooling, and neurological signs in pets, but sensitivity differs by species, so verify the safety of each specific Thuja before planting in a garden frequented by cats or dogs.
All Thuja species we cover
- Arborvitae
- Chinese Arborvitae
- Danica Globe Arborvitae
- Degroot's Spire Arborvitae
- Emerald Green Arborvitae
- Emerald Green Arborvitae
- Golden Globe Arborvitae
- Holmstrup Arborvitae
- Japanese Arborvitae
- Korean Arborvitae
- Mr Bowling Ball Arborvitae
- Pyramidalis Arborvitae
- Rheingold Arborvitae
- Sichuan Arborvitae
- Stoneham Gold Western Red Cedar
- Western Arborvitae Zebrina
- Western Red Cedar
Thuja — frequently asked questions
Are Thuja plants toxic to cats and dogs?
Most Thuja are not pet-safe. Of the 17 Thuja species in the Growli library, 13 (76%) carry a toxic or mildly-toxic ASPCA classification and 4 are pet-safe. Always confirm the exact species on its pet-safety page before trusting it around cats or dogs.
How much light do Thuja plants need?
Most Thuja do best in direct sun. If yours stretches toward the window or loses its variegation it wants more light; scorched or bleached leaves mean it is getting too much direct sun.
Are Thuja easy to care for?
Some Thuja suit more experienced growers — several want strong light, sharp drainage or a specific seasonal rhythm. Check the individual species page for the exact regime.
How many Thuja varieties are there?
Growli's care library covers 17 Thuja species and varieties — browse them all above. They share a similar light, water and soil pattern, so once you learn one Thuja, the rest follow closely.
Comparing apps rather than plants? PictureThis alternatives — 7 plant ID apps compared.