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You do have several options for your area. The only limitation is the cool temperatures, but these species listed on this link will survive in your area: http://www.bonsai-and-blooms.com/cold-climate-bonsai-tree-types.html

Check with your local government for regulations on transfer of plant material.

The first consideration is water deficit/drought stress. Without sufficient water the foiage will dry and die.

Generally, care for plants during the winter is pretty easy. I will include several articles that you will find helpful.

This article is for apartment gardening, but will apply here as you will need to keep these in container: https://www.gardeningknowhow.com/special/urban/apartment-gardening-guide.htm

This article is for bonsai Junipers: https://www.gardeningknowhow.com/houseplants/bonsai/first-bonsai.htm

This is for the Myrtle Topiary: https://www.gardeningknowhow.com/ornamental/shrubs/myrtle/how-to-grow-sweet-myrtle.htm

This is for Cycad care: https://www.gardeningknowhow.com/ornamental/foliage/cycads/growing-cycad-plants.htm

It is a little difficult to tell because of the plant's condition, but the bark suggests that it is a Ficus of some kind. Most likely a subcultivar of Ficus benjamina.

This article will help: https://www.gardeningknowhow.com/houseplants/ficus/ficus-tree-care.htm

This article will help with bonsai maintenance: https://www.gardeningknowhow.com/houseplants/bonsai/first-bonsai.htm