This is a very similar project to what The Arcadia Project is doing in the Yokojulia Adjunct. There is a page on the website defining a Garden World that is probably worth a review.
Instead of making specific lists on this page, I would recommend you simply tag any garden worlds you discover with the "Category:Garden World" tag; that will automatically add them to the list that is already being created under that category. Thoughts? Ddfairchild (talk) 05:53, 23 April 2017 (UTC)