Answer: It does sound puzzling, especially after 5 years. As long as the trees look otherwise healthy, I think the leaf size is normal for your trees in their particular growing sites. The only thing that might make a difference in the size of the leaves is a difference in exposure to sunlight in their new site. The more shade a dogwood receives, the larger the leaves produced; brighter shade or even exposure to a little more sunshine can affect the size of the leaves.
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