Very pretty. I had two pots with 3 P. caerulea in each. Grew really big (they are from last year, and survived in really cold room over winter. Looks like they loved it. They are full of blooms now. Last Sat. I braced up, untwined the two pots (they were close to each other) and un-potted one, and planted directly in the garden. It's supposed to be hardy here (the only one, this caerulea variety) and just like it was. All 3 plants together. Didn't even separated the roots (as they were bound in the pot).
