Catananche caerulea Cupid's dart
I found this beautiful plant for the first time yesterday. It really is a lot more blue than the photos show. It is native to SW Europe and north Africa and is a short lived perennial. It grows very tall, to a height of 50~70cms and was growing out of limestone crags. It flowers from May to July. It was used by the ancient Greeks in love potions, hence it's common name.