RDA & DRIPotassium Do bananas have more potassium when they are green and less when they are ripe? By Joanne Larsen 0 1031 Facebook Twitter Google+ Pinterest WhatsApp Do bananas have more potassium when they are green or less when they are ripe? I eat a banana every morning. The potassium of green and ripe bananas is the same. Bananas and orange juice are very good sources of potassium.