Answer: Sounds like that poor mimosa is really trying to survive, so why not give it a little more time? Prune back the obviously dead parts of the plant, and encourage any new shoots to grow as big as they can. As they develop, the new shoots can be trained into new trunks. You can gently scrape the bark off the top branches or trunks to see if they're dead or alive. Live wood will have green tissue just below the bark. If the tissue is brown, prune the wood back until you find live tissue, even if this means pruning it all the way down to the ground. The new shoots should develop into new trunks and eventually you'll have a new mimosa tree.
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