... peaches, grapes, apricots, hawthorn, persimmon, citrus, dates, wolfberry fruit Vegetable plants: tomatoes, cucumbers, peppers, beans, leeks, eggplant, zucchini, garlic ... Economic plants: tobacco, tea, sugar beets, sugar cane, hemp, watermelon ... nitrogen-free fertilizer, and stages of sugar-rich fruit, vegetables and crops help to increase sugar content ...