I potted a bunch last summer in large kitty litter bins. I drill holes in the bottom and put some gravel on the bottom. They all did well. Unfortunately, I went into winter with a dozen still in pots. Tried to keep them in the garage - and they all got rust so I put them outside in a sheltered corner, mulched well.
Winter was too warm, with too much rain and not enough snow. Lost every single one of them. Actually, the last one is dying now - nothing I have done with it has saved it. I will never leave daylilies in pots through the winter again. Granted, in a normal winter, this might not have been a problem.
I am learning now to tip them on their side for the winter - I still will never leave daylilies in pots any more through the winter, at least not where I live.
By the way, the parsley I kept in my garage all winter did great.
And spring this year has been weird too - too much heat too early, then too many frosts & freezes since then along with gray damp and rain. I just lost another daylily this week out in my gardens. But loosing one in the gardens vs a dozen in pots - well there is my answer. ~Jan