If you want to uplift your tubers - it's not essential as long as you have good drainage - then here are some tips for how to go about lifting, dividing, and storing
How to Dig Up Tubers
Digging up tubers is easy.
After the first frost has blackened the foliage, cut off all but 2 to 4 inches of top growth.
Carefully dig around tubers with a pitchfork (or shovel) without damaging them.
Lift and gently shake the soil off the tubers. Allow to sun dry to harden the dirt, making it easy to brush off afterwards.
once clumps dried off and dirt removed with a brush, soak the clump for a half hour or so in a bucket of water and a couple of capfuls of bleach - this deals with any nastys hiding on your tubers, it kills nemotodes and slaters that eat dead wood and just cleans the tubers up for labeling. Air dry once done.
divide. below is a video from white flower farm overseas talking about dividing dahlias. see the article on storage options for next steps.
https://www.youtube.com/watch?v=7tZWg7PFDxA&fbclid=IwAR1SqNMbHx6DsoLcIHTaW2DJMfIdEnuLX97ooKKZlQrH3V-yUUb9rfqStrY
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