Leo in N E Illinois
The Professor
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Think about working with locally native species, then you won't have issues with trees surviving the low humidity and brutal sun of the high desert. And they could be wintered on your balcony without much difficulty. Especially look for native species who's range extends quite a ways north of you. Potentilla is a deciduous, native, hardy to cold end of zone 4, some maybe into zone 3, yellow flowers in summer and pretty good as bonsai. Ponderosa pine & Limber pine also come to mind.