Potatoes DO have potassium.
Potatoes are a good source of potassium at 422 milligrams per half a medium potato with its skin. If you like sweet potatoes, these are an even better choice for potassium intake at 508 milligrams per. Additional vegetables that are high in potassium include tomato juice (535 mg per cup), avocado (450 mg for one-half), asparagus (288 mg per cup), pumpkin (282 mg per one-half cup), and Brussels sprouts (247 mg per one-half cup)
Though there is no standard RDA for potassium, the recommended amount seems to hover around 1600-2000 milligrams per day.