I have a 5 ft high Rowan, which I have been given. It is in a large container but I plan to plant it in my garden, excellent soil there. However, it has various branches growing out very close to the ground of the main trunk. I think Rowans just have one main trunk... but I'm afraid to prune if this is detrimental. Each of the branches growing low has beautiful berries on it and the tree is healthy. Thanks.