Last year was my first year purchasing some named Peonies. The 2 potted ones I bought in late spring both bloomed this spring, and 1 of the 3 from Songsparrow bloomed, so I guess that's pretty good. Those from SS were from the end of season buy 2 get 1 free sale, so perhaps since 5 of the 8 I added this year spent less time out of the ground, they may be more likely to bloom. In any case, the new ones that didn't bloom this year will be likely to show off in 2015.
