|I'm looking for Rhododendrons that will thrive in Sunset Western Garden guide zone 23.
very interested in the "Chriso Rey"
|Some of the Maddenii types grow quite readily in southern California and the tropical Vireyas do well in the Los Angeles basin and along the frost-free coast.
Here's a website with lists and descriptions of proven performers for your gardening region:
This website is sponsored by the American Rhododendron Society; the Southern California Chapter has rated various rhodies and included pictures, as well.
Hope you find the site helpful!