I have four tulip poplars in my back yard alone. Three of them are about 5 years old and maybe 15 feet tall. (they grow fast)
The fourth one is a fully mature tree that is huge.
Some don't like these trees because they say they drop small branches each year.
I haven't seen much of that with mine.
I really like them because they make a perfect shaped/nice looking lawn tree.
They have huge leafs. This is from one of the 5 year old trees.