This is just something that happened to me this summer. In the spring, I was moving plants around etc. As usual, I didnt finish and so help me God, The plants that I just set on the ground and never touched again, are doing fabulous and the ones I planted look like grass. I was so amazed by this, that when I took my big seedlings that didnt bloom out of the earth boxes, instead of culling them, yep, I just set them over in the flower bed and I did throw a little soil around the edges to keep them kinda contained. YES indeed they're doing great.
Ive never been able to keep a daylily alive planting it below the ground. Ive always heard and been told to plant the crown up, otherwise, if its damp, you get crown rot....and I can vouch for that. That is not to say that some dont pull themselves down. I leave them until they are to deep to bloom.