GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on November 10, 2019
The American Dahlia Society recommends storing tubers in vermiculite.
Since you are in zone 8b, you can leave your tubers in the ground and after frost kills the foliage, cut the plants back and cover with 3 to 4 inches of mulch.
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlias-annual-or-perennial.htm
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/storing-dahlia-tubers.htm
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