Pieris japonica 'Amamiana' is a shrub commonly called Lily of the Valley Shrub. Because it doesn't get cold enough here to grow actual Lily of the Valleys, this is as close as we are going to get. It isn't fragrant*** like the original, but it is beautiful when it blooms this time of year. Many of these shrubs have a pink or red tint to the blossoms, but I love this pure white one in my Moonlight Garden in SJC. They are related to Azaleas and prefer shady, moist spots in the garden. I had planted one in Laguna that did not survive, probebly because the shade there is very dry. They are supposed to get to nine or ten feet tall, but I must admit I have never seen them more the three or four feet. I must admit I have never seen one growing in anyone's garden, but that may be because I have never noticed them out of bloom, which is what they are when most garden tours take place. I have two of them and will be interested to see how they do here over the years.
*** Editors note: after being questioned about the lack of fragrance I went out and got down and gave it a sniff test and yes, there is a fragrance and I'm sure when the shrubs get larger it is much more evident!