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Bob: Cornelian cherry, in my experience, wants to look like a shrub. Mine
tried hard to be one, and I had to trim it constantly to get it to look like
a tree.
It sends out suckers every year fromthe base to the lower branches, and I
keep cutting off the suckers. What you might do is let maybe two or three
twigs grow for a year, see which one is the most vigorous, and prune out the
others. Of course, the line of least resistance is let it do it's thing
and be a shrubby tree, but if you end up with a lot of leaders as Dave says,
it'll be subject to splitting. It's a great tree, tho, very attractive with
its
fuzzy yellow blooms well before forsythia blooms. I've never had fruit on
mine, but when they produce well, it's very colorful then too. Good luck
with it!
Wendy in Zone 5