What are the varieties of azaleas/rhododendrons that will bloom most prolifically in zone 11?
Hawaii has special problems, temperate climate with no seasons. There is a American Rhododendron Chapter in Hilo, Hawaii. It can be contacted at:
They have a list of "Proven Performers" at:
The list is all Vireya Rhododendrons which are subtropical and tropical plants originating from places like Borneo and New Guinea. The recommended varieties include:
A source of such plants is:
Here is a link that might be useful: Hawaii Chapter of American Rhododendron Society