I purchased Rollercoaster Rush and Mountain Wildflower from Mark in the fall of 2015 and neither has bloomed, but both a healthy, strong plants. Rollercoaster Rush has increased from one fan to four, but still no blooms.
I also purchased and received two single fans of New Plateau from Mark last week. They were leek sized fans with good root systems. Hopefully I will see blooms from all three this spring. I would recommend Mark as a good seller and he communicates every step of the way.