Several years ago I purchased a plant that looked like a tree trunk . Leaves sprouted out from the sides and the top had a wax covering that needed to be scraped off. The leaves are dark green and long with a pointed end. However the leaves started to turn black and eventually dropped off. It no longer produces leaves and is just a dried looking trunk. Before I toss it, does anyone know what it is and if it can be revived?
Sounds like an ex Dracaena of some kind, sometimes called Ti tree. If you take an old cane from a mature Dracaena, and plant it in compost, leaves sprout at the top once roots form. Yours, though, sounds as if it was grafted, if it had a wax covering at the top. A photo of it whilst it still had leaves, even blackened leaves, may have helped with proper ID.
To tell whether it's completely dead or not, scrape away a bit of the bark with your fingernail in a few places - if it's brown and dry beneath, it's like the proverbial dodo, but if it's moist and greenish, then there's hope.