Gilia capitata - Globe Gilia

Annual wildflower to 2 ft. Charming clusters of blue flowers spring into summer. Great for butterflies, bees, and song birds. Full to part sun. Low water, will accept some supplemental water. Prefers fast-draining soils, tolerates sand and clay soils. Hardy to 10°F. 

Photo Credit: Colin Durfee 

https://www.flickr.com/photos/146003125@N02/50080814098