Funny, all these rhododendrons blooming makes me think of them! My (fuzzy) recollection is that there is some formal group which maintains the wooded portion of the property and that the "new" family residing in the home is in an "easement" agreement that this group will maintain what the Zabel's created... but no annual tours.

"When a legacy such as Art and Peggy's garden has been a part of this community for so many years, it is only natural that we would ask what would become of it. After Art's passing, the community was told that the garden was purchased by the Angela J. Bowen Conservancy Foundation and will be maintained by them as a wildlife habitat. Sheri Fulton, Art and Peggy's daughter, said, "We thought it would be a comfort for the community to know that it would be maintained. That's what our parents would have wanted." Many articles have been written in The Olympian newspaper over the years. One article in May 2001 indicated that legislation had been introduced with the purpose that the garden would be cared for in the future. Unfortunately, that legislation did not pass."

Here is a link that might be useful: Rhododendron and Azalea News