In the northeast US, this is a dull time of year as far as plants and trees are concerned. The leaves are all gone off the trees and bushes that have leaves that fall off in autumn. The grassy areas are still a bit green, but not pretty. It is cold and dreary.
This is great time to look at seed catalogs. You can browse for hours and pick out what you want to order.
I have pictures of some root vegetables that can be grown in this area as well as other places.
The pictures are all from Wikipedia Commons except for the first two. They are from the US CDC, Center For Disease Control.