Thanks all for the nice comments.
Louis, they don't bloom at the same time, cyanea bloom in winter, the 2
NOID bloom in spring and the concolor/tricolor bloom in late spring. Fortunately, there are 2 or more divisions of each on that tree.
Will try to post pic when they are in bloom but I doubt if I could take a good photo of the flowers. Except for the cyanea, all of them have tiny flowers. The spikes look better than the flowers, lol.