Here is a list of Botanical Gardens in the US
http://en.wikipedia.org/wiki/L...
Here is a list of Public gardens around the world
http://en.wikipedia.org/wiki/L...
I have not checked this one out yet but I hope it helps you find the ones near you
Here is another way to find a Public garden near you
http://www.publicgardens.org/g...
Please feel free to add your own list of public gardens
or web sites for your favorite gardens