You can harvest multiple crops at a time by dragging the combine or crate across the row of fields. You must start at the field that was selected. You can harvest multiple kinds of crops or multiple kinds of orchards and berry bushes at one time, but you cannot harvest crops and orchards or berries together. For example, corn and wheat can be harvested together. Apples and raspberries can be harvested together. Corn and apples cannot be harvested together.