Terry was right. Garden tours listed in the brochure are open to the public at any time—if one knows where they are. I was a bit disappointed having expected something a bit more spectacular. They were nice, quiet, peaceful places to get away from it all, but nothing to write home about.
I only made it to three of them before my bad leg started giving me trouble and I had to give it up. Will try again next year now that I have a list of the addresses.
Saw these on my way home. There are a lot these colorful surprises along the sidewalks of Amsterdam.