Experts and BHG readers answer.
Japanese Tulip Tree, Magnolia
I think you are referring to the Chinese tulip tree, Liriodendron chinense. This is a beautiful deciduous tree from China and Vietnam, that may reach 40 feet tall at maturity. If it has been planted recently, there is no need to fertilize until the tree is established. If the soil is poor you might want to fertilize lightly each spring therafter. It will not need to be trimmmed back unless any branches become damaged or broken. It will grow into a lovely column of green and should bear goblet-shaped greenish flowers in early summer. Enjoy!