One reason why metasequoia trees are known as living fossils is that they have been able to exist for millions of years. Not only do metasequoia trees grow really fast, but they are also able to adapt to different environments. South Korea started planting them in urban areas because these trees can endure polluted air quite well.
Due to metasequoia trees' ability to withstand many plant diseases, they are able to live for very long. However, the most serious infection that can damage them is a canker infection. When a tree has a canker infection, you'll start seeing discolorations on its branches.
