The summer of 2011 was the first year mine bloomed. Gorgeous. Then last year no blooms. I had scattered seeds and so many produced plants that I had to pull many. I left the mother plants, but they didn't bloom. I wonder why? I think I need to fertilize that bed (includes peonies, daylilies, lilies, monarda, etc) as it somewhat underperforms the other beds. I am thinking lack of fertilizer was the answer to why they didn't rebloom in 2012. Mine are like the picture in your article, have survived several moves prior to 2011 and were/are very healthy plants with flowers that start out almost silver then darken to a deep lavender.
Oberon46, I think you might be right about the fertilizer, especially with the assortment that shares that bed with sea holly. Peonies and lilies tend to suck up the goodies (have you ever tried to move a mature peony? NOT.)
I hope your sea holly blooms this year. Be sure to keep us posted.