Answer: It's difficult to determine why your tree isn't thriving, but you can remove any dead or dying branches to help improve the appearance of the tree and to encourage it to put out new growth. Inspect it carefully for signs of insect activity or symptoms of disease. If you find nothing topside, there may be a problem with the roots - overwatering, underwatering, too much or too little fertilizer. Tulip trees don't have a reputation for any particularly fatal diseases, so you may be dealing with a cultural or environmental problem. I'd prune it back and wait to see what happens. Good luck!
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