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Atlantic White Cedar vs Northern White-Cedar

These two species only overlap in the wild in a small part of New England, but both are widely planted in landscaping. Both have scale-like foliage and seed cones that release wind-dispersed seeds. They can be easily told apart by their foliage as well as their seed cones; their bark is similar but has some differences. Not all trees can be distinguished by bark alone.

Atlantic White Cedar (Chamaecyparis thyoides)

Northern White-Cedar (Thuja occidentalis)

A native evergreen conifer of acidic wetlands of the east coast.
A slow-growing, medium-sized coniferous tree of the northeast, found on moist sites and those with neutral to alkaline pH.
Foliage is finer, more rounded around the twig, and branches more irregularly.
Foliage is thicker, strongly flattened, and branches more, in a highly-regular pattern.
Foliage bluish-green.
Foliage often yellowish, especially when growing in sun.
Unripe seed cones greenish but covered in pale whitish coating, more stout, spherical, and lumpy, with scales not as clearly visible.
Unripe seed cones are green, longer and narrower, with clearly-visible scales.
Bark averages more reddish; ridges tend to be narrower and often spiral around the trunk slightly.
Bark averages more grayish; ridges tend to be wider, and are more consistently oriented vertically.