Notice the single trunk tapering to a slender central leader. Dawn redwoods grow rapidly and continue to put on new growth all season. If there is an early fall frost the stem tips or central leader may get damaged and influence the apical dominance. Often however, another stem at the top of the tree will take over and become dominant or can be trained to do so.
Karren Wcisel, TreeTopics.com
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Cupressaceae, tree, conifer, cone, needle, deciduous, dawn redwood