I'm trying to do a little detective work today. I saw this beautiful flower all over the place when I visited California. Since these don't grow where I'm from, I am not familiar with it. I did a little research, and I think these are African lilies, also known as Agapanthus Africanus. If any of you California folks can confirm or correct this, please do!
These flowers grow very much like the day lilies that I am accustomed to in the midwest. They have long, narrow leaves, and a central flower stalk, with blue, funnel-shaped flowers. They grow to be 1 - 2 feet high.
Agapanthus Africanus are originally from South Africa. They do well outdoors in the southernmost part of the country. During the summer, they require a lot of water. My research indicated that most gardeners plant them in containers, which made me wonder why I saw so many in California. Hmmm. It's a mystery!