I've certainly downsized my garden but there may be a time when I should decided to downsize even further and the pic in the link below will be my guide. It is so cute, including the picket fence.
Here is a link that might be useful: Small Garden
There is a beautiful small garden on the south hill in Spokane Washington. It is about 9'x12'. Among other things they grow the most beautiful dahlias. The summer squash plants get about 4' tall.
That's a cute miniature garden. Something like this could be a project for our sidelined posieh! Put it on a table, no bending, heavy garden work required and it should feel good to her green thumb.
I have seen miniature gardens for indoors and in outdoor containers.
There is a nursery near us that holds classes on how to make and maintain miniature gardens. The owners are good friends for many years.
Here is a link that might be useful: nursery
Here is a link that might be useful: Enchanting Gardens...Miniature
All of these gardens are great! They are delightful.
Oh gosh, those are beatiful gardens.