i suppose it depends on how much space you have in a greenhouse ... yo have many options here ..

we used to dig.. dry and pack them in boxes. and put them in the basement in my z5 ground freeze MI ...

someone closer to your zone is going to have to tell you about all that ..

you can split them now or in spring ... just make sure any wounds you make dry before storing ...

there is really no reason to store media and the pot if space is at a premium ...

ken

btw.. the elephant ears post right near this one .... is the same basic winter storage issue.... the rules dont have to be all that specific ... learning the general parts will serve you well ...

ken

i suppose it depends on how much space you have in a greenhouse ... yo have many options here ..

Well, the main greenhouse is 200 sq.ft (20x10x7), but it's hard to heat so I have a smaller greenhouse inside of it! That one has a small dedicated heater, and it's a lot warmer.

I read that the optimal winter temperature for them is 45-50:

https://whyfarmit.com/overwintering-dahlias/

Knowing that, I guess that I really need to dig them up and put them in the basement :-/ That's a little bit of a challenge since I also had daffodil bulbs in the same pot, so I'll have to figure out which is which and then put the daffodils back.

I store mine in my Greenhouse. I heat it to 40 in the winter. They're in a container with vermiculite.