The agricultural output of a farm as defined herein, and related products that contribute to farm income, may be sold from the farm for wholesale or retail use. " U-pick" and farm stand marketing and sales shall be specifically permitted. Both farm and non-farm produced products may be sold from a farm stand provided that non-farm products occupy not more than 25% of the retail area of the stand. All farm stands shall be operated only during daylight hours and only during the normal "growing season" for this area.