On the other hand, here is a list of produce that you should buy organic because these foods are the most contaminated: • Apples • Blueberries (domestic) • Celery • Cherry tomatoes • Cucumbers • Grapes • Hot peppers • Lettuce • Nectarines (imported) • Peaches • Potatoes • Snap peas (imported) • Spinach • Strawberries • Sweet bell peppers