I have a daylily bed that looks just like yours Sabrina, with concrete on both sides. It has nice loam/sand mixture in it so I don't have trouble digging. Since it is narrow, I plant only mini type daylilies in it and they do well. I have Butterpat, Little Wart, Luxury Lace, Green Eyes Wink, Ruby Stella, and Cragmoor Sweetheart in it, along with some small noid's.
