My philidendron has long vines with healthy leaves on the ends and not leaves in the middle. will it regrow leaves in the middle?
It is not very likely. You can trim them up some, leaving some healthy leaves, and it will likely force branching in the bare spots, though. Here is an article on their care: https://www.gardeningknowhow.com/houseplants/philodendron/caring-for-philodendrons.htm