Hi Jill,

Thank you for reaching out to the Cooperative Extension’s Ask Extension service.

Peeling bark on a Cryptomeria tree can be caused by natural shedding, environmental stress from extreme temperatures, or damage from pests. It's important to check the exposed wood; if you see dark growths or fungus, it may need attention. If there are no signs of growths or fungus and the plant's foliage appears unaffected, there is probably nothing to be concerned about. Since you said this started last month with the extreme cold temperatures, it is very likely the cause. Extreme heat, cold and wet weather can loosen the bark. When the sun comes out and dries the bark too rapidly, it can split from the tree particularly on the south side face of the tree.

Keep a watch on your tree and look for any other signs of distress. If there’s no evidence of pests or fungus and the exposed wood looks healthy, the peeling isn’t a concern. In the case of a Cryptomeria, some browning of branches is part of the natural process. 

If you have any other questions, please call our Garden Line at<personal data hidden>.