Landscape designer,  recently posted an article on Houzz with an interesting selection of small-scale trees for patio spaces which I thought you might find useful.

I however strongly disagree with using a Crepe Myrtle in a Patio space. They are in flower in July and attract bees which is not what you want – especially during one of the highest use times for such an outdoor space. Although I like them the fig and citris are not well suited for my area (top of Virginia).

9. European Hornbeam (Carpinus betulus)

Read the full article.