I've been trying to figure out what the small, about 2-foot high, tree in my living room is. It looks from pictures to be a Dracaena fragrans. It was left behind by a neighbor and clearly turning brown and dying. I've been trying to save this plant for several months but don't know what I'm doing wrong. There are still some green leaves, but for the most part they are brown or brown on the outside and green in the middle. Should I cut the brown leaves off?