Tulip Poplar

Question

How mature does a Tulip Poplar have to be in order to bloom?

Answer 1

Despite all that rapid growth, the flowers may not appear until the plants are 15 years old. A relatively tall tree can still be too immature to bear blooms. When the flowers finally do appear, they bloom high up in the tree and may not be visible with the naked eye. If the tree appears to have no blossoms, examine the branches through binoculars to locate hard-to-spot blooms.

https://www.gardeningknowhow.com/ornamental/trees/tulip-tree/growing-tulip-trees.htm