Chamaecyparis thyoides (Atlantic white cedar, Atlantic white cypress, southern white cedar, whitecedar, or false-cypress), a species of Cupressaceae, is native to the Atlantic coast of North America and is found from southern Maine to Georgia and along the Gulf of Mexico coast from Florida to Mississippi. It is one of two species of Chamaecyparis found in North America. C. thyoides resides on the East Coast and C. lawsoniana can be found on the West Coast. The species grows in forested wetlands where they tend to dominate the canopy. The trees are associated with a wide variety of other wetland species because of their wide north-south range. The remaining populations are now found mostly in remote locations that would be difficult to harvest, so its popularity as a source of lumber has decreased.

Atlantic white cedar grows within 100 miles of the coastline and less than 50 m above sea level along much of the East Coast and Gulf Coast. Rare populations grow in the foothills of the Appalachian Mountains, where the tree may be found up to 460 m above sea level. Altered fire regimes, logging, and draining of wetlands outside of the few protected areas have all contributed to the general decrease in the size and occurrences of Atlantic white cedar strands. The tree is listed as Rare in Georgia and New York, of Special Concern in Maine, and Extirpated in Pennsylvania.

Atlantic white cedar is an evergreen tree in the Cupressaceae (cypress) family that may grow 60 to 80 feet tall with a narrow columnar diameter of 2 feet. The foliage is scale-like and green to blue/green in color. The bark is fibrous with intersected flat ridges, which sometimes spiral along the stem. In North Carolina it is found in the coastal plain along bogs, streams, swamps, and other wet sites. They tend to be the dominant species in wet forests.

The Atlantic white cedar prefers sandy, peaty, moist to wet soil in full sun to part shade and tends to grow on small mounds, with water pooling in the depressions surrounding them. Use this plant in wet areas with poor drainage along ponds, streams, or boggy sites.

It provides cover for wildlife and is a larval host plant for butterflies.

Available as a set of three tubelings, as in photo. ("Tubelings" are young seedling trees (or bushes) that are approximately 16 inches tall, (24 inches with the tube). These plants are grown rapidly in a greenhouse in plastic "plug" containers, and at the age of 6 months are as big and strong as a field-grown plant a year old.) They could be transplanted to gallons or deep tree bands for the winter or directly to the garden. Protect from deer.