Question
QUESTION: I recently transplanted a willow oak that is about 15 feet tall and the base is about the size of a baseball. The tree is leafing out nicely.  However, the top has forked out.  I cannot tell which is the dominant trunk.  What do you suggest so that the tree will grow tall and straight?

ANSWER: If the fork is above four feet up the trunk I would leave it be. Forked trees do well as one stemmed trees. If you just can not stand to see a fork then wait until one shows dominance (it is taller than the other) then cut the shorter one off. You may have an unbalanced crown for a couple of years but over time it will fill in. If it were me I would let it grow as is.

---------- FOLLOW-UP ----------

QUESTION: Thanks for the quick reply.  I forgot to mention that the forks in question is at the top of the tree.  Each fork is a little under 3 feet long.  I doesn't look bad so following your advise I will just leave it for a couple of years and see how it turns out.  Is that about right?

Answer
If they are that high up the tree they will be no problem. In fact I would think they are just part of the crown and will not be the terminal but over time be side branches. Let it grow and later if you are still unhappy you can think about maybe pruning some off.