Biennial plants, such as Asparagus and most of the Cabbage family, need to winter over. Potatoes can be grown from tubers or from seed, unlike other Root Vegetables such as Radishes, Beets, Carrots, and Onions. Tomato seed should be fermented. Beans, Eggplant, Lettuce, Okra, Melons, and Peppers, self pollinate and are easy to grow. Corn, Peas, Sunflowers, Spinach, and the Cucurbits family cross pollinate and need to be watched. Wheat is sown and then Threshed. Many fruit trees such as Guava can be grown from the fruit pit.