Catananche (Cupid's Dart)

Catananche is derived from the Greek word for love potion, so it makes sense that this flower is also called "cupid's dart" or the "love plant". Blooms of Catananche appear continuously from early to late summer and are at their peak in midsummer. Plants are rather narrow and upright with little foliage, and single specimens do not make much of a show so plant 3 or 5 in a group to make a better display. Dead head regularly and cut back hard at the end of the season. 

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"Caerulea"

A favourite of flower arrangers, the papery, bright blue dandelion-shaped blossoms are beautiful. Plants form a low clump of narrow grey-green leaves, the lovely flowers appearing on upright stems in summer.  
Height: 18-24 in.
Spread: 12-15 in.
Sun Exposure: Full Sun
Zone: 4