The ATP plant database can now be used to indicate and find plants suitable for mini gardens. Each plant indicated may not be suitable for all *locations/climates/environments* in which mini gardens might be grown, but the indication is intended to signify plants with appropriately small foliage, slow growth, no tendency to try to rule the world overnight, from which suitable selections can be made.
It can be added to the data report under "uses."
It will take some time for users to contribute this attribute to a number of plants for a search to produce many results, so part of the reason for this post is to ask mini gardeners to help with contributing this info as they have time to do so.
If you haven't already made a list of your plants here on ATP, I think you're short-changing yourself. It's such a handy tool in so many ways, and I stopped editing my spreadsheet because I no longer need it. Making a list of your plants is not necessary to contribute to info in the database though, so please participate at whatever level you are able.
Happy to help with any questions, either personally if I know the answer, or by promise to alert somebody who knows, to the question.