I would cut them back drastically and put them in plastic bags (the grocery store type). You could then put peat around the roots, OR just ship them bareroot. When they get there, whomever is receiving them could then put the roots only, in water, changing the water every 3rd day. Make sure that you add a name tag in each bag. I also write on the outside of the bag. I have kept dormant bareroot daylilies in a bag for a month, sprinkling them with water every so often until I was ready to replant them.
One warning about greenhouses. Some daylilies are dormant and need to have COLD for some part of the winter. I forget exactly how that is done, but I know hybridizers like Lee Pickles has them in and out of a greenhouse so that they will die back and stay dormant (so they will bloom)
Best wishes. RI is nice.
