Answer: Twenty years is a long time, but trees typically live much longer than that. I would prune out all of the dead limbs and branches to make room for the new growth. Pruning usually results in lots of new growth, so you should see a dramatic increase in healthy new leaves and stems. If the tree does not respond well to pruning (wait until next summer before making a judgement), then you can remove it and replace it with something else. Redbuds are such attractive trees that I think it's worth the effort. Best wishes with your landscape!
Q&A Library Searching Tips