I have several Japanese maples in my yard., spontaneously seeded
from a low-growing specimen tree. The tree has since been killed
by the local deer, who ate all the buds off every spring until
the tree died. The seedling maples are several years old, but
stunted from being nibbled on. This year I want to dig them up
soon, before the deer get at the growth buds, and try to develop
them as bonsai.

After I dig them up and pot them, this winter I have several
choices. Which do people recommend? And what kind of treatment?
1. West-facing window, indoors, normal temperatures.
2. West-facing unheated greenhouse.
3. Indoors under fluorescent lights.
4. Outdoors, perhaps moved inside if severe weather and winds
threaten.

This is in Maryland, zone 7.