One place to get inspiration for the use of miniature plants is Disneyland in California. Here are some examples seen from the ride  “Storybook Land” which takes a boat ride through classic story landscapes. You can see Mr. Toad’s house, Pinocchio’s village, Cinderella’s castle and other fantasy locations, all in tiny scale. The plants here are mature since they are many years old and they are beautifully scaled.