Spinach, lettuce, asparagus, mustard greens, turnip greens, beet greens, kale, parsley, collard, bok choy, cauliflower, broccoli, cucumber, celery, red, green or Chinese cabbage, zucchini, sweet or hot peppers, yellow summer squash, beets, carrots, kohlrabi, red or yellow onions, turnips, watercress, radish, pumpkin, avocados and Brussels sprouts.