I just can join to all my previous writers - stunning bunch of flowers.
I've got one P. lowii in flowering size with one !!!! evolving flower and another bud at the moment. But I'm not envious, not green with envy, no, no, no!!!!!!!!!!
I measured the petal spread and it was 6 inches. This is a division of one of Frank Smith's plants. I have another lowii division that is even nicer but the division was small and is not blooming size yet.