Yellow poplar tree / Tulip tree not blooming?

I have a Tulip Tree that has never bloomed. Is it true that you need 2 trees to get the ';tulip'; blooms? My tree is only 4 years old...so I'm wondering if it is just not mature enough.Yellow poplar tree / Tulip tree not blooming?
It will be a few years before it blooms; it is too young. You don't need 2 trees.Yellow poplar tree / Tulip tree not blooming?
It's still a baby. Give it time.