Tip: Potassium power. MyPlate.gov sent this bulletin at 02/20/2017 08:00 AM EST Potassium power. Sweet potatoes, white beans, tomatoes, beet greens, & spinach are all vegetable sources of potassium. Diets rich in potassium may help to maintain healthy blood pressure. Try some of these potassium-packed recipes: Sweet Potato and Black Bean Stew Potato Spinach Lasagna Spinach Salad with Apples and Eggs Having trouble viewing this email? View it as a Web page.