I have a land at the bottom of a mountain, the temperature is high in the winter, about -10 Celsius. The soil is not so mineral rich. The winter is long and the summer is short. In general on this kind of land people grow potatoes. I was thinking of making a fish farm, to sell fish to the city I live in, the land is 100 KM away from the city. Or another option is to grow cranberries and sell the to the local market and other countries. Another option is to grow mushrooms and sell them.