It is a bush. Here is a good photo of one that looks to be 5 or 6
years old growing in a sunny location.
If you want to contain it to a single bush, pull up all the small ones
that come up around it every spring when the dropped seed sprout.
Those that "look" like a small tree have had the trunk trimmed to get
that look. You have to contiounly keep the sprouts trimed off all
during the year every year to get that look. I let mine do their
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