Swiss Chard, Spinach and Beet Greens
Green leafy vegetables like swiss chard, spinach, and beet greens all contain high amounts of various nutrients and minerals, including potassium. When served raw, they can have between 140-290 mg of potassium per cup. Despite the fact that leafy vegetables tend to shrink when cooked, the potassium content stays the same.
Dates, Raisins, and Prunes
Some common dried fruits are dates, raisins, and prunes. When fruits are dried, all their nutrients become concentrated. This, of course, includes potassium. One cup of prunes has 1,274 mg of potassium, which is almost five times the amount of potassium in one cup of plums.