Is there a way to know the names of the rhododendrons in the garden, a map or possible guide?

There are usually little plaques with the Latin name as well as the common name close by.

The staff is lovely…very knowledgeable and helpful. Just ask…they love to share their knowledge about the many varieties.

There are some little plaques, but not for all the rhododendrons. As for a map with to identify the plants, your best bet would be to ask at the check in desk.