The rows and plants in my front yard beds are about 20" apart. I have a lot more room in the backyard bed so the rows and plants are about 3' apart. I have a small area in the corner of that bed where I cram all the extra plants/tubers. The plan is just to save them and hope they produce tubers for next year. Any blooming is a bonus. Even though they're planted only 10-12" apart, many grow and bloom as well as those in the main bed.
