When aiming for an alkaline diet, dark leafy greens and most green vegetables are great choices. Kale, collards, chard, lettuce, spinach, arugula and all other leafy greens qualify. Other alkaline green vegetable choices include broccoli and broccoli rabe, green peppers, zucchini, celery, artichokes and cucumbers. Brussels sprouts are a rare exception in the vegetable family, with more acid-forming qualities than other vegetables. Green asparagus is an alkaline vegetable, but white asparagus is more acid-forming.