I received 2 American Redbud seadlings when I joined the Arbor Day Foundation. They are now about 18 months old and 4' tall. Neither one has a dominant leader and I'm not familiar enough with the tree to know if there should be a single leader. The leaders are longer than the tree is tall. Should I cut off the less dominant leader? Should I cut back each leader? Should I prune some of the lower branches? I'm assuming this is a summer flowering tree(?). When is the best time to prune it? I believe I read that these trees prefer partial shade. Is this true? I'd like to transplant them this autumn once they drop their leaves. Thanks in advance for any advice.