Tour a Scotts Valley Nursery:

Bay Laurel Nursery, a superbly landscaped twelve acre wholesale nursery, located at 1554 Bean Creek Road, Scotts Valley, California 95066, is a leading supplier of rhododendrons, camellias, pieris, vaccinium, viburnum, and other plants to retail nurseries.
https://web.archive.org/web/20170710153644/http://www.baylaurelnursery.org/
On Saturday, March 31, 2017 at 10 AM the Monterey Bay Chapter of the American Rhododendron Society will have a tour of Bay Laurel Nursery.
Information on the Monterey Bay Chapter, and the rest of the American Rhododendron Society can be found at:
https://www.facebook.com/MontBayARS/
https://www.rhododendron.org
https://www.rhododendron.org/membership.htm