Dahlias gone brown and died. Will tubers be useless and need destroying

Question

I think they have not had enough water.Can I save the tubers by cutting back and try to reinvigorate them by soaking in water.

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Answer 1

You can prune away the dead plant material and continue to care for the plant. I see lots of green growth still on the plant.
This article will help you.

https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/grow-dahlias-in-containers.htm