Single fans here seem to take forever to increase. When it is affordable and if I can only find a certain daylily that I want and it is only a SF, I will get a second SF. I would rather see two fans in one hole than just one.
I know it is just me, but a SF looks so lonely by itself. We have one single fan (Kaleidoscope Puzzle) coming in the spring, and it will have to remain a SF until it increases or maybe we will get lucky and receive an extra fan (probably not). The hole is ready and waiting in a bed that I have just finished redoing this past weekend.