Answer: You're right about the ultimate size: Japanese blueberry tree, Elaeocarpus decipiens, grows 30 to 60 feet tall and about half as wide. Usually it is recommended as a street, lawn, or park tree. However, if you'd really like to try the tree, you could maintain it in a large (3 or more feet in diameter) container for several years at least.
It's an uncommon and interesting tree. Good luck!
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