They took months to root. I hadn't expected such a delay, but maybe the cold had already shut down some survival mechanism; I don't know. In fact, only one cutting survived. I coddled it along and put it outside in a small pot on the patio table when spring rolled around. It slowly grew, but never bloomed. In late summer, I repotted it. Still no blooms. I brought it inside anyway in the fall and gave it half a shelf in the sunny window of the laundry room, where it continued to grow and sprawl and, finally, this winter, to bloom.
I'd tell you what it is, but I can't remember its name. I've thumbed through my mental catalog of blue-flowering annuals (Browallia? Streptocarpus?), but nothing sounds right. For now, it remains a gorgeous stranger.