Answer: It's possible the canes have died back because the roots were exposed to air. Try pruning the top back to see if it resprouts. If you get new growth in a few weeks, the canes are still alive and should produce new shoots and new foliage. If you get no new growth at the top you may have to prune everything down to where it shows live material. After pruning the remaining parts of the canes should produce healthy new growth. Hope so!
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